List of ThunderCats (1985 TV series) episodes

ThunderCats is an animated cartoon series created by Rankin/Bass Productions.

Season 1 comprises 65 episodes - a standard number for animated series at the time, as it allowed the series to be shown every weekday for thirteen weeks (one full broadcast season). The series' two-part pilot episode debuted starting January 23, 1985, with airdates varying by market; WTOG aired it on January 23,[1] while WNEW aired it on February 1.[2] The series subsequently began airing in its regular weekday time slot on September 9. In 1986, the series returned for a TV movie, ThunderCats - Ho!, which was subsequently aired as five separate episodes worked into the continuing rerun rotation of Season 1. The second season, which produced sixty episodes, was broadcast as three seasons between 1987 and 1989. Each broadcast season began with a five-part miniseries that established the new concepts and characters that would play into the events of the season that followed.

The entire series has been released on DVD, collecting both seasons across two box-sets. Season 1, Volume 1 was recalled when it was discovered that the second episode was missing its background musical score, and a corrected version was released in its place. Volume 1 was released on August 9, 2005, and Volume 2 on December 6, 2005.

Series overview

SeasonEpisodesOriginally aired
First airedLast aired
165January 23, 1985 (1985-01-23)December 20, 1985 (1985-12-20)
225October 1, 1986 (1986-10-01)October 9, 1987 (1987-10-09)
320September 5, 1988 (1988-09-05)September 30, 1988 (1988-09-30)
420September 4, 1989 (1989-09-04)September 29, 1989 (1989-09-29)

Season 1 (1985)


This list presents the episodes in their original broadcast order, which is also the order used for the DVD release of the series. However, in the case of the first season, this is not a chronological story order, and results in several events occurring out of order; most notably, the five-part mini-series, "Lion-O's Anointment," is spread throughout the season instead of being presented consecutively. When the series was re-aired on Cartoon Network years later, it was presented in an alternate, more chronologically-correct order; this was based on the show's production order, but with multi-part episodes arranged consecutively.

No. in
No. in
Title Written by Original air date Production
11"Exodus (Pilot: Part One)"Leonard StarrJanuary 23, 1985 (1985-01-23)11
The ThunderCats[4] must find a new home after their home planet, Thundera,[5] explodes. Their journey changes when an enemy force, the Mutants,[6] attack and leaves their ship severely crippled. With the others forced into sleep capsules, Jaga must pilot the ship for the world known as Third Earth.[7] Lion-O – who is adult-like in appearance, but retains the mentality of a young boy – must learn what it means to become a man and the Lord of the ThunderCats as he learns to wield the power of the Sword of Omens.[8]
22"The Unholy Alliance (Pilot: Part Two)"Leonard StarrJanuary 23, 1985 (1985-01-23)22
While exploring Third Earth, the Mutants' ship, piloted by Slithe, Monkian and Jackalman, is brought down by a mysterious black pyramid;[9] it is the home of Mumm-Ra, an evil demon sorcerer, who is willing to form an alliance to capture the Eye of Thundera.[10] Lion-O, the young Lord of the ThunderCats, is about to face his toughest enemy yet.
33"Berbils"Leonard StarrSeptember 11, 1985 (1985-09-11)33
Panthro introduces the ThunderTank,[11] saving the others from a meteor shower – conjured by Mumm-Ra – that buries the remnants of the ThunderCats' ship. Later, Lion-O and Snarf are taken prisoner by a band of small robotic bears named Ro-Bear Berbils, led by Ro-Bear Bill and Ro-Bear Belle.[12] They soon learn that the Berbils are being frequently attacked by the Trolligs,[13] who steal their fruit to give to the Giantorrs.[14]
44"The Slaves of Castle Plun-darr"Leonard StarrSeptember 12, 1985 (1985-09-12)44
The Cats' Lair[15] is nearly complete when an agitated Wilykit and Wilykat rush home to tell the other ThunderCats that the Mutants have enslaved a race of creatures called Brute-Men[16] to build their new fortress, Castle Plun-darr.[17] After learning more about the Brute-Men from the Berbils, Tygra tells the twins to stay behind, as the adult ThunderCats rush off to free these peaceful creatures.
55"Pumm-Ra"Jules BassSeptember 13, 1985 (1985-09-13)66
Mumm-Ra disguises himself as a Thunderian named Pumm-Ra, and claims to have rescued Cheetara from the mutants in order to infiltrate the now completed Cats' Lair.
66"The Terror of Hammerhand"Ron Goulart and Jules BassSeptember 16, 1985 (1985-09-16)77
Snarf is captured after freeing a unicorn from the pirate Hammerhand and his Berserkers,[18] who are out hunting for food. Lion-O meets the Unicorn Keepers[19] and then sets out to free Snarf from his captors.
77"Trouble with Time"Ron Goulart and Jules BassSeptember 17, 1985 (1985-09-17)55
The Mutants are looking for a "feminine touch" around Castle Plun-darr, and attempt to capture natives of the Third Earth. Willa, of the Warrior Maidens,[20] is introduced, and she and her sister, Nayda, manage to fight off Monkian; both of the Warrior Maidens are cautious of the new arrivals (i.e., the ThunderCats and the Mutants). Lion-O also takes the ThunderTank for a short-lived joyride, whilst Tygra looks for Thundrylium[21] in a strange cave and begins to age at an accelerated rate.
88"The Tower of Traps"Leonard StarrSeptember 18, 1985 (1985-09-18)88
Wilykit and Wilykat meet a traveling Wolo[22] and then go in search of a piece of stolen jewellery. Wilykat becomes a prisoner locked up in a tower. Lion-O and Wilykit must find their way to him through a maze of booby traps, set by a mysterious being known as Baron Karnor.
99"The Garden of Delights"Barney Cohen and Jules BassSeptember 19, 1985 (1985-09-19)99
Tygra chases a giant worm underground and encounters the Molemen.[23] After following them, he runs into Mumm-Ra, who has disguised himself as a flower named Silky. Tygra is drugged and used against his fellow ThunderCats to steal the Sword of Omens. Mumm-Ra and the Mutants capture Willa, in an effort to use the Sword and destroy the ThunderCats.
1010"Mandora - The Evil Chaser"William OvergardSeptember 20, 1985 (1985-09-20)1010
Lion-O finds what looks like a spaceship's escape pod; he opens it and inadvertently releases the galactic convicts Quickpick, Burnout, and Plutar. Mandora the Evil Chaser is introduced and Lion-O assists her in trying to recapture the convicts, encountering the Living Ooze and the subterranean Mudhogs[24] along the way.
1111"The Ghost Warrior"Leonard StarrSeptember 23, 1985 (1985-09-23)1111
While searching for treasure inside an ancient tomb, two Bolkins,[25] Bundun and Hurrick, accidentally release the ghost of the evil Grune the Destroyer. Grune knows of the ThunderCats and reveals an ancient and storied past with Jaga. The Bolkins, Wolos, and Berbils urge the ThunderCats to help them against this powerful foe.
1212"The Doomgaze"Stephen PerrySeptember 24, 1985 (1985-09-24)1212
Mumm-Ra forms an alliance with an ancient priestess who has the power to mesmerize males with her gaze.
1313"Lord of the Snows"Bob HaneySeptember 25, 1985 (1985-09-25)1313
A meteor of pure Thundrylium crashes into the remote Hook Mountain. When Lion-O goes after it, he finds himself face to face with a man of the mountain whom he must fight. This is also the first appearance of Vultureman.
1414"The Spaceship beneath the Sands"Leonard StarrSeptember 26, 1985 (1985-09-26)1414
After repeated defeats, the Mutants ask Mumm-Ra to return their ship, which he buried in the desert around his pyramid. Once it is resurfaced, they have new weapons to use against the ThunderCats.
1515"The Time Capsule"Peter LawrenceSeptember 27, 1985 (1985-09-27)1515
The ThunderCats decide it is time to search for their time capsule from Thundera, which has been missing since they crash-landed on Third Earth.
1616"The Fireballs of Plun-Darr"William OvergardSeptember 30, 1985 (1985-09-30)1616
The Tree Top Kingdom is attacked by fire balls launched from a new weapon inside Castle Plun-darr. When Tygra goes to investigate, he is captured and locked into a device which will rip him apart by pulling out his four limbs. Lion-O and Willa must rescue Tygra and destroy the Mutants' new weapon.
1717"All That Glitters"Bob HaneyOctober 1, 1985 (1985-10-01)1717
Mumm-Ra tricks Lion-O and Tygra into fighting each other, which causes the Sword of Omens to break. In order to repair it, the ThunderCats seek the help of a being whose powers are derived from bathing in liquid gold.
1818"Spitting Image"Howard PostOctober 2, 1985 (1985-10-02)1818
After Driller captures Panthro, Mumm-Ra creates an evil clone of the real Panthro to turn the people of Third Earth against the ThunderCats.
1919"Mongor"Peter LawrenceOctober 3, 1985 (1985-10-03)2024
While exploring, the ThunderKittens stumble across an old temple where their curiosity gets the best of them and they release a demon – a goat-like creature who gets more powerful as others fear him. It's up to the ThunderCats to find a way to overcome their fears and defeat this monster.
2020"Return to Thundera"Bob HaneyOctober 4, 1985 (1985-10-04)2125
The Mutants unleash a new invincible war robot while Lion-O accidentally travels back in time to Thundera after he enters the Time Capsule's hologram. There, he meets his father, Claudius, who gives him a scroll containing the secret of the War Robot.
2121"Dr. Dometone"William OvergardOctober 7, 1985 (1985-10-07)3033
A frog robot swallows Wilykit. It turns out to be piloted by Dr. Dometome – the scientist responsible for maintaining the ocean's plug, which stops the ocean draining into the Earth's core.
2222"The Astral Prison"Peter LawrenceOctober 8, 1985 (1985-10-08)3134
When Jaga is imprisoned in the Astral World, Lion-O must journey there to free him. However, there is no way for him to return.
2323"The Crystal Queen"Leonard StarrOctober 9, 1985 (1985-10-09)2428
A rare and beautiful bird is captured by the queen of a crystal kingdom.
2424"Safari Joe"Stephen PerryOctober 10, 1985 (1985-10-10)2629
Safari Joe comes to Third Earth looking for prey worthy of being hunted, and begins hunting the ThunderCats.
2525"Snarf Takes up the Challenge"Peter LawrenceOctober 11, 1985 (1985-10-11)2226
After the ThunderCats are captured by Mumm-Ra, it is up to Snarf to save them.
2626"Sixth Sense"Peter LawrenceOctober 28, 1985 (1985-10-28)2932
A ship in trouble tries to ask the ThunderCats for help using Cheetara's sixth sense. It ends up taking control of Cheetara, putting her life in danger as the mutants attack it.
2727"The Thunder-Cutter"William OvergardOctober 29, 1985 (1985-10-29)3638
Lion-O meets Hachiman, a samurai who wields a sword called the Thunder-Cutter.
2828"The Wolfrat"Chris TrengoveOctober 30, 1985 (1985-10-30)4046
Vultureman builds a robot called the Wolfrat, which uses a miniaturization gas to reduce the ThunderCats to nine inches tall. They must rely on a normal-sized Snarf to help them defeat the robot.
2929"Feliner - Part One"Stephen PerryOctober 31, 1985 (1985-10-31)3941
Vultureman summons the Mutant warlord, Ratar-O, who kidnaps Snarf's nephew, Snarfer, on the planet of Snarfs. They bring Snarfer back to Third Earth and use him as bait to trap the ThunderCats.
3030"Feliner - Part Two"Stephen PerryNovember 1, 1985 (1985-11-01)4542
The ThunderCats race to try to salvage the part they need for the Feliner from the wreck of the Rat Star before the Mutants can complete repairs. Snarf contemplates leaving the Thundercats forever.
3131"Mandora and the Pirates"William OvergardNovember 4, 1985 (1985-11-04)2327
After Mandora boards a space freighter – which turns out to be the ancient space-pirate ship The Jolly Rogers – for inspection, she needs Lion-O's help.
3232"Return of the Driller"Howard PostNovember 5, 1985 (1985-11-05)2730
Mumm-Ra instructs the Driller to bore a tunnel from the Acid Lake to the Cats' Lair; it's a race to save the Lair as they face many obstacles while trying to obtain and bring back a sponge cloud to fill the hole.
3333"Dimension Doom"Bob HaneyNovember 6, 1985 (1985-11-06)3336
Wizz-Ra returns from the seventh dimension once every seven thousand years; this time, he enters Cats' Lair through a mirror in Cheetara's room. Mumm-Ra, his ancient enemy, is able to steal his magic helmet. He then enslaves the ThunderCats, and only Cheetara and Snarf are left to help their new friend before his time runs out.
3434"Queen of 8 Legs"Stephen PerryNovember 7, 1985 (1985-11-07)3235
Disguised as a diamond fly, Mumm-Ra entices Lion-O into Spidera's Kingdom of Webs.
3535"Sword in a Hole"William OvergardNovember 8, 1985 (1985-11-08)4445
The ThunderCats respond to a space liner's SOS, only to be captured by mercenaries paid by Mumm-Ra. The Sword of Omens is cast into a black hole.
3636"The Evil Harp of Charr-Nin"Douglas Bernstein and
Denis Markell
November 11, 1985 (1985-11-11)5151
Wilykit and Wilykat find a magic harp containing a genie. Mumm-Ra offers to free the genie if he helps to destroy the ThunderCats.
3737"Lion-O's Anointment First Day: The Trial of Strength"Leonard StarrNovember 12, 1985 (1985-11-12)1919
Snarf tells Lion-O that he must earn his title as Lord of the ThunderCats by completing five trials, the first of which will be to defeat the mighty Panthro.
3838"The Demolisher"Bob Haney and
Peter Lawrence
November 13, 1985 (1985-11-13)3840
A bored galactic conqueror comes to Third Earth to battle Mumm-Ra. After defeating Mumm-Ra, and hearing of the ThunderCats power, he rushes off to battle Lion-O.
3939"Monkian's Bargain"Lee SchneiderNovember 14, 1985 (1985-11-14)5353
Monkian makes a deal with Mumm-Ra to give him power orbs – whatever the cost.
4040"Tight Squeeze"Stephen PerryNovember 15, 1985 (1985-11-15)5252
After a disagreement, Vultureman leaves Castle Plun-darr and destroys all the Mutants' technology. Slithe is forced to ask Mumm-Ra to take away the ThunderCats' weapons, which he seals within the sword chamber so that the ThunderCats cannot reach them.
4141"The Micrits"Bruce SmithNovember 18, 1985 (1985-11-18)4849
Lion-O is captured by very small creatures who see him as a threat to their village, and disable Cats' Lair and the ThunderTank. The Mutants seize the opportunity and wreak havoc on the other ThunderCats, who do not know where Lion-O is.
4242"Lion-O's Anointment Second Day: The Trial of Speed"Leonard StarrNovember 19, 1985 (1985-11-19)2520
Lion-O must beat Cheetara in a race to pass the second anointment trial.
4343"The Rock Giant"Peter LawrenceNovember 20, 1985 (1985-11-20)3537
Mumm-Ra awakens a monster made of rocks to defeat the ThunderCats.
4444"Jackalman's Rebellion"Bruce SmithNovember 21, 1985 (1985-11-21)5555
Jackalman forms his own army and steals weapons from the Mutants.
4545"Turmagar the Tuska"C.H. TrengoveNovember 22, 1985 (1985-11-22)2831
A strange traveller crash-lands next to Cats' Lair and enlists the ThunderCats' help to battle a war machine.
4646"Lion-O's Anointment Third Day: The Trial of Cunning"Leonard StarrNovember 25, 1985 (1985-11-25)3421
Lion-O must outwit Wilykit and Wilykat in the Maze of Infinity. However, there are more than ThunderKittens lurking about and ready to stop him.
4747"The Mumm-Ra Berbil"Jeri CradenNovember 26, 1985 (1985-11-26)5858
Mumm-Ra disguises himself as an injured Berbil to infiltrate Cats' Lair.
4848"Mechanical Plague"Peter LawrenceNovember 27, 1985 (1985-11-27)3739
Mumm-Ra takes advantage of the ThunderCats being separated as they make their own home movies. He gives life to a mechanical plague of robots to aid in his plot to destroy the ThunderCats.
4949"Trapped"Stephen PerryNovember 28, 1985 (1985-11-28)6161
Sheltering from a storm inside an old Suspension Capsule,[26] Wilykit and Wilykat become trapped. Things take a turn for the worse when the Mutants find out about it.
5050"Lion-O's Anointment Fourth Day: The Trial of Mind Power"Leonard StarrNovember 29, 1985 (1985-11-29)4222
Lion-O must overcome Tygra's mental powers and face his greatest fear.
5151"Excalibur"Peter LawrenceDecember 2, 1985 (1985-12-02)4143
Disguised as King Arthur, Mumm-Ra schemes to gain possession of Excalibur, the most powerful sword ever created.
5252"Secret of the Ice King"Bob HaneyDecember 3, 1985 (1985-12-03)4344
Frozen for a thousand years, an Ice King is suddenly awakened, and wreaks havoc on Hook Mountain.
5353"Good and Ugly"Peter LawrenceDecember 4, 1985 (1985-12-04)4647
Two aliens arrive in spaceships and fight near Cats' Lair. Lion-O must learn a lesson about first impressions.
5454"The Transfer"Lawrence DuKore
and Lee Schneider
December 5, 1985 (1985-12-05)6262
An unknown ship containing a dangerous radioactive device approaches Third Earth.
5555"Divide and Conquer"Lee SchneiderDecember 6, 1985 (1985-12-06)4748
Vultureman creates a voice imitator. The Mutants use it to trick the ThunderCats into splitting up to trap and destroy them.
5656"Dream Master"Heather Winters and
Annabelle Gurwitch
December 9, 1985 (1985-12-09)6464
Mumm-Ra assumes the form of the Dream Master to take control of the ThunderCats' unconscious selves.
5757"Out of Sight"C.H. TrengoveDecember 10, 1985 (1985-12-10)5454
Willa is captured by the Mutants. Tygra makes himself and Nayda invisible to infiltrate castle Plun-darr, not knowing the consequences.
5858"The Mountain"Danny PearyDecember 11, 1985 (1985-12-11)5656
Out of sheer boredom, Lion-O climbs an unknown mountain. The Mutants decide to attack, putting themselves and the ThunderCats in danger.
5959"The Superpower Potion"C.H. TrengoveDecember 12, 1985 (1985-12-12)5050
In his quest to defeat the ThunderCats and rule Third Earth, Vultureman decides to make a potion that gives him superpowers.
6060"Eye of the Beholder"Kenneth E. VoseDecember 13, 1985 (1985-12-13)5757
The ThunderCats create a fake Sword of Omens and use it to trick the Mutants; the plan backfires when Snarf is captured.
6161"Lion-O's Anointment Final Day: The Trial of Evil"Leonard StarrDecember 16, 1985 (1985-12-16)4923
Lion-O must defeat his greatest enemy, Mumm-ra, to complete the trials.
6262"The Trouble with ThunderKittens"Kimberly B. MorrisDecember 17, 1985 (1985-12-17)5959
Eager to prove that they are old enough for adult weapons, Wilykit and Wilykat sneak off with the other Thundercats' weapons for some practice. The Mutants seize an opportunity and the kids escape, but the weapons are now in the hands of the Mutants. The kids will have to confess to Lion-O what they did in order to gain his help in retrieving them.
6363"Mumm-Rana"Bob HaneyDecember 18, 1985 (1985-12-18)6060
After a space battle, the Mutants' escape pods land next to a white pyramid. Inside, they meet Mumm-Rana, the good equivalent of Mumm-Ra. Mumm-Ra arrives and takes control of her mind, hoping to use her power against the ThunderCats.
6464"The Shifter"Matthew MalachDecember 19, 1985 (1985-12-19)6363
Vultureman builds a device that switches the consciousness of two beings and takes aim at the ThunderCats.
6565"Fond Memories"Lee SchneiderDecember 20, 1985 (1985-12-20)6565
Disguised as Dr. Dometone, Mumm-Ra decides to lure Lion-O into a living museum of the ThunderCats' most formidable enemies.

Season 2 (1986–87)


Note: ThunderCats Ho! and Mumm-Ra Lives! were originally broadcast as stand-alone TV movies.

No. in
No. in
Title Written by Original air date Production
661"ThunderCats - Ho! Part One"Leonard StarrOctober 1, 1986 (1986-10-01)[27]6666
Lion-O is awakened by recurring nightmares of Thunderians being killed on Thundera as he fled to safety with Jaga and the other ThunderCats. Jaga comes to tell him that they in fact survived and are living on Third Earth. After meeting with the other ThunderCats, they decide to begin searching for them, but Mumm-Ra has plans as well.
672"ThunderCats - Ho! Part Two"Leonard StarrOctober 1, 1986 (1986-10-01)6767
Lion-O's rescue attempt fails and the captured Thunderians are taken to Fire Rock[28] Mountain after another failed attempt on their part to break free from their captors.
683"ThunderCats - Ho! Part Three"Leonard StarrOctober 1, 1986 (1986-10-01)6868
Lion-O loses the Sword of Omens in an avalanche. Panthro battles the Fist-Pounder with the ThunderTank. The Mutants arrive at Fire Rock Mountain to take control of the prisoners.
694"ThunderCats - Ho! Part Four"Leonard StarrOctober 1, 1986 (1986-10-01)6969
The Thunderians attempt to escape their prison. Lion-O arrives at Fire Rock[28] Mountain and is confronted by Hachiman, who believes Lion-O is causing the suffering of his ancestor.
705"ThunderCats - Ho! Part Five"Leonard StarrOctober 1, 1986 (1986-10-01)7070
Lion-O and Hachiman reconcile and the ThunderCats close in on rescuing the Thunderians from Fire Rock[28] Mountain. They will need supernatural help if they are to pass through the Thundranium gasses to reach them.
716"Mumm-Ra Lives! Part I"Leonard StarrSeptember 17, 1987 (1987-09-17)[30]7171
Mumm-Ra is weak and faces the threat of three new ThunderCats; he sends the Mutants to release his old enemies, the Lunatacs, imprisoned in Dark Side[29] in order to bolster the forces of evil. The ThunderCats' celebration of their victory over Mumm-Ra and the welcoming of three new ThunderCats is cut short when Snarf overhears plans at Castle Plun-darr after he chased Ma-Mutt there from the Berbil village.
727"Mumm-Ra Lives! Part II"Leonard StarrSeptember 17, 1987 (1987-09-17)7272
The Mutants succeed in releasing the Lunatacs. The ThunderCats discover their Thundrylium[21] mine is being looted and people are being kidnapped from the villages. Lion-O and the ThunderKittens have their first run-in with a Lunatac and Bengali's skills as a blacksmith come in handy.
738"Mumm-Ra Lives! Part III"Leonard StarrSeptember 17, 1987 (1987-09-17)7373
The ThunderCats build the Tower of Omens to monitor for Sky Tomb, which will be run by the new ThunderCats. Disguised as a Berbil,[12] Ma-Mutt spies on the ThunderCats' plans and the Lunatacs are sent to destroy the Tower. Snarfer contacts Snarf to tell his uncle that he's returning to Third Earth.
749"Mumm-Ra Lives! Part IV"Leonard StarrSeptember 17, 1987 (1987-09-17)7474
Mumm-Ra's power is restored. Snarfer makes it to Third Earth, but crashes in Dark Side. The ThunderCats rush to his aid before the Lunatacs can get a hold of him.
7510"Mumm-Ra Lives! Part V"Leonard StarrSeptember 17, 1987 (1987-09-17)7575
The ThunderCats look for Sky Tomb to free the slaves imprisoned inside it. Bengali must learn the importance of teamwork as Lion-O leaves him with guard duty. Lynx-O and Cheetara run reconnaissance to find out if Mumm-Ra is truly back or not.
7611"Catfight"Chris TrengoveSeptember 21, 1987 (1987-09-21)7676
By disguising himself as Jaga, Mumm-Ra tricks Lion-O into believing the new ThunderCats are traitors so that they will fight amongst themselves.
7712"Psych Out!"Sandy FriesSeptember 22, 1987 (1987-09-22)7777
Mumm-Ra tells Alluro where to find a talisman that boosts the self-confidence of the one who possesses it so that they become nearly invincible. Snarf learns that true courage comes from within.
7813"The Mask of Gorgon"Romeo MullerSeptember 23, 1987 (1987-09-23)7878
Ma-Mutt digs up an ancient book, which leads Mumm-Ra to search for the ancient evil of the mask of Gorgon.
7914"The Mad Bubbler"Kimberly MorrisSeptember 24, 1987 (1987-09-24)7979
The Lunatacs look for Thundrylium[21] in a cave on Hook Mountain, only to be driven mad by a strange creature that turns them against each other.
8015"Together We Stand"Herb EngelhardtSeptember 25, 1987 (1987-09-25)8080
Mumm-Ra coats the Bezerker's weapons and armor with Thundranium[28] and Wilykit and Wilykat find that guarding Cats' Lair is not always a breeze.
8116"Ravage Island"George Hampton
and Mike Moore
September 28, 1987 (1987-09-28)8181
Mumm-Ra activates a mesmerizing beacon on Ravage Island, which draws the ThunderCats to it and takes hold of their minds.
8217"Time Switch"Sandy FriesSeptember 29, 1987 (1987-09-29)8282
While taking care of a dangerous Suspension Capsule,[26] dug up near Cats' Lair, Lion-O is exposed to harmful gasses inside that cause him grow younger. If the ThunderCats do not find a solution in time, he will rapidly become younger until non-existent.
8318"The Sound Stones"J. Larry CarrollSeptember 30, 1987 (1987-09-30)8383
Vultureman builds a sonic gun from a sound stone he stole in Dark Side as the Lunatacs join with him to attack the Tower of Omens.
8419"Day of the Eclipse"Kimberly MorrisOctober 1, 1987 (1987-10-01)8484
The day of the centennial total eclipse has arrived, and any spell Mumm-Ra casts will last until the next eclipse. He declares a "Day of Decay" on the Cats' Lair, causing it to fall apart.
8520"Sideswipe"William OvergardOctober 2, 1987 (1987-10-02)8585
Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens with Berbil Mexican Takeout. When Mandora gets involved, Chilla freezes her and becomes a fugitive from the law as Mandora sets her sights on bringing her in.
8621"Mumm-Rana's Belt"James RoseOctober 5, 1987 (1987-10-05)8686
Luna discovers that her grandmother's magic belt is now in the possession of Mumm-Rana, who claimed it after battle. She heads straight for the white pyramid, with Pumyra hot on her tail.
8722"Hachiman's Honor"J. Larry CarrollOctober 6, 1987 (1987-10-06)8787
While Hachiman is on his way to the Tower of Omens, Luna steals his sword, the ThunderCutter, and gives it to an automaton. Lion-O and the ThunderKittens head out to find their old friend.
8823"Runaways"Bill RatterOctober 7, 1987 (1987-10-07)8888
Fed up of feeling useless, Wilykat convinces his twin to run away from home, but living on their own is more dangerous than they realized. The other ThunderCats search desperately to find them as they all must learn a lesson in communication.
8924"Hair of the Dog"Chris TrengoveOctober 8, 1987 (1987-10-08)8989
While all the ThunderCats except Lion-O are gone, Mumm-Ra switches Ma-Mutt with Snarf. Ma-Mutt poisons Lion-O, allowing Mumm-Ra to move in.
9025"Vultureman's Revenge"Herb EngelhardtOctober 9, 1987 (1987-10-09)9090
Vultureman builds a Thundranium[28] projector, capable of creating concentrated regions of Thundranium. When the ThunderKittens damage it, he damages their spaceboard, sending them off into danger. While Lion-O and Snarf search desperately for them, Vultureman plans his revenge.

Season 3 (1988)

No. in
No. in
Title Written by Original air date Production
911"ThunderCubs Part I"Peter LawrenceSeptember 5, 1988 (1988-09-05)9191
Mumm-Ra learns of the treasure of Thundera[31] and the Sword of Plun-darr that destroyed Thundera. He recreates Thundera and travels there whilst the ThunderCats try to find him.
922"ThunderCubs Part II"Peter LawrenceSeptember 6, 1988 (1988-09-06)9292
After being rescued, the ThunderKittens give a presentation on their observations of New Thundera. Vultureman renovates The Rat Star to ambush the ThunderCats on their way to New Thundera.
933"ThunderCubs Part III"Peter LawrenceSeptember 7, 1988 (1988-09-07)9393
Mumm-Ra claims the Sword of Plun-darr and nears the treasure of Thundera. The ThunderCats land on New Thundera.
944"ThunderCubs Part IV"Peter LawrenceSeptember 8, 1988 (1988-09-08)9494
The Mutants arrive and Mumm-Ra has them hide a decoy Book of Omens,[32] leading the ThunderCats in the wrong direction.
955"ThunderCubs Part V"Peter LawrenceSeptember 9, 1988 (1988-09-09)9595
The ThunderCubs[33] return to Third Earth and join with the ThunderKittens to mount a rescue mission and infiltrate Sky Tomb whilst Lion-O continues to battle Mumm-Ra.
966"Totem of Dera"J. Larry CarrollSeptember 12, 1988 (1988-09-12)9696
Mumm-Ra recovers the Totem of Dera[31] and learns of its healing powers, which can be used to bring inanimate objects to life. He sends the Mutants out to use it against the ThunderCats.
977"Chain of Loyalty"Bill Ratter and
Peter Lawrence
September 13, 1988 (1988-09-13)9797
Whilst studying the Book of Omens,[32] Lion-O learns of the Chain of Loyalty[31] and Jaga instructs him to recover it from New Thundera. When Mumm-Ra breaks the chain, the ThunderCats turn against each other and Lion-O must find a way to stop them from destroying each other.
988"Crystal Canyon"Sandy FriesSeptember 14, 1988 (1988-09-14)9898
Tygra finds a powerful stone that slowly takes control of his mind. He refuses to listen as Lion-O tries to warn him that the stone is dangerous.
999"The Telepathy Beam"Kimberly MorrisSeptember 15, 1988 (1988-09-15)9999
Vultureman uses a new weapon on Cheetara, overwhelming her sixth sense in an attempt to destroy her confidence and distract her from sensing the truth: Panthro has become a prisoner and was enslaved to upgrade Sky Tomb to be able to make a trip to New Thundera.
10010"Exile Isle"William OvergardSeptember 16, 1988 (1988-09-16)100100
The ThunderCats capture the Lunatacs, put them on trial, and exile them to a desolate planet. However, there is another old enemy of the Thundercats trapped on Exile Isle, with whom the Lunatacs soon team up to plan a destructive return to Third Earth.
10111"Key to Thundera"Matthew MalachSeptember 19, 1988 (1988-09-19)101101
During an attempt to decode the Book of Omens, Lion-O accidentally traps himself within its pages, prompting Mumm-Ra to try to steal the book from Cats' Lair. Meanwhile, Panthro discovers a mysterious key on New Thundera.
10212"Return of the ThunderCubs"J. Larry CarrollSeptember 20, 1988 (1988-09-20)102102
Tygra, Cheetara, and Panthro fall under Mumm-Ra's power on New Thundera, and he tries to use Cheetara's sixth sense to locate the Treasure of Thundera. To rescue his friends, Lion-O must convince the mutants to fly him from Third Earth in The Rat Star.
10313"The Formula"Kimberly MorrisSeptember 21, 1988 (1988-09-21)103103
Alluro's new super-fuel formula for Sky Tomb unexpectedly seems to boost the growth of local plant and animal life to massive proportions. Luna orders the mutants to spray it around Cats' Lair, leaving the ThunderCats trapped in a gigantic, savage garden.
10414"Locket of Lies"Bill RatterSeptember 22, 1988 (1988-09-22)104104
Mumm-Ra creates an evil trinket that the Thundercats mistake for a piece of the Treasure of Thundera. It soon leads them into deep trouble on New Thundera, and nobody is around to rescue them.
10515"Bracelet of Power"Bill RatterSeptember 23, 1988 (1988-09-23)105105
The Feliner returns from New Thundera with a mysterious bracelet. When Snarf puts it on, he discovers it has the power to turn ThunderCats into his obedient servants. While he toys with this new power, Mumm-Ra plots to steal the bracelet for his own evil purposes.
10616"The Wild Workout"Becky HartmanSeptember 26, 1988 (1988-09-26)106106
The Lunatacs hook up exercise machines to generate power for Sky Tomb's engines, but their own laziness forces them to find Thundercats to do the hard work. Meanwhile, Mumm-Ra plans to lure the ThunderCats into a freezing trap in the Caverns of Cold on New Thundera.
10717"The Thunderscope"George Hampton
and Mike Moore
September 27, 1988 (1988-09-27)107107
Lion-O and Snarf recover a mysterious telescope from the wreckage of their original spaceship. Mumm-Ra recognizes it as the Thunderscope, which allows its user to locate pieces of the Treasure of Thundera. Lion-O must discover its purpose and keep it out of Mumm-Ra's evil hands.
10818"The Jade Dragon"William OvergardSeptember 28, 1988 (1988-09-28)108108
Mumm-Ra discovers the power of one of the pieces of the treasure of Thundera. The Double-Headed Dragon of Doom, or the Jade Dragon, possesses the power to entrap people in its stomach. The legend says that Hachiman's ancestor gave the dragon to his wife as a marriage gift, and since her father was so against their marriage, he put a curse on the dragon and it engulfed Hachiman's ancestor. Jaga freed him, and he gave the dragon to Jaga for safe keeping. Now, the ThunderCats have found the Jade Dragon, and Mumm-Ra manages to trap Lion-O and Cheetara in it. Hachiman is their only hope.
10919"The Circus Train"William OvergardSeptember 29, 1988 (1988-09-29)109109
Captain Bragg, a bounty hunter, comes to Third Earth to help the Thundercats get rid of the Mutants and the Lunataks. He tricks Wilykat into going with him and they go after the Mutants. After capturing them, they try to capture the Lunataks. They capture all except Luna and Amuk, who free the other Lunataks, put Bragg in a cage, and tie Wilykat to the train's engine.
11020"The Last Day"J. Larry CarrollSeptember 30, 1988 (1988-09-30)110110
Impatient with Mumm-Ra failing them time and time again, the Ancient Spirits of Evil give him one final chance: destroy the ThunderCats within twenty-four hours, or face exile. To this end, he is granted extraordinary power, and grows to a gigantic size. Mumm-Ra spreads destruction all over Third Earth, sends Tygra, Cheetara, and Panthro to limbo, and buries Lion-O alive. He then attacks and destroys the Tower of Omens, and eventually sends the Thunderkittens to limbo too. Snarf goes into the Book of Omens to learn how to defeat Mumm-Ra. Jaga and the other ThunderCats in limbo help free Lion-O and he learns from Snarf that Mumm-Ra only has until sunset to defeat the ThunderCats. Mumm-Ra fails and the Ancient Spirits of Evil banish him from Third Earth.

Season 4 (1989)

No. in
No. in
Title Written by Original air date Production
1111"Return to Thundera! Part I"Peter LawrenceSeptember 4, 1989 (1989-09-04)111111
The Ancient Spirits of Evil give new life to Mumm-Ra and Ma-Mutt, send them to New Thundera, and build a new Pyramid for Mumm-Ra. The ThunderCats say goodbye to Third Earth and depart for Thundera, leaving Tygra and Pumyra behind to watch the Tower of Omens and Cats' Lair. The ThunderCats soon arrive and begin plans to build a new lair. Mumm-Ra, meanwhile, learns that the planet's gravity is controlled by the Gyroscope under the Churning Rocks at the center of the planet. He tries to use this knowledge to destroy the ThunderCats and trick the Gyroscope's guardian, the ancient sorceress Jaguara.
1122"Return to Thundera! Part II"Peter LawrenceSeptember 5, 1989 (1989-09-05)112112
More and more earthquakes are occurring because of the malfunctioning Gyroscope. Meanwhile, Lion-O receives a distress signal from Thunderian refugees, and he, Cheetara, and Snarf go to find them. Mumm-Ra resurrects Grune the Destroyer, and Grune seeks out Lion-O and Cheetara. Grune finds and fights them, breaks the Sword of Omens, and chains them up on the Churning Rocks. Snarf, who was hiding, gathers the pieces of the Sword to take back to Bengali to be fixed. Snarf gets captured by Char, a thief who wants the Sword for himself.
1133"Return to Thundera! Part III"Peter LawrenceSeptember 6, 1989 (1989-09-06)113113
Lion-O, Panthro, and the ThunderKittens take the Whisker, a new flying vehicle, to the Churning Rocks to rescue the Thunderian refugees who called them from there. The ThunderCats get captured by Two-Time, a robot with two heads. Two-Time takes them aboard his spaceship, Dome-Down, and the ThunderCats see that he has also captured the refugees. Lion-O defeats Two-Time and the refugees are freed. Meanwhile, Lynx-O, Cheetara, and Bengali spot Mumm-Ra near the Churning Rocks, and inform Lion-O of this. Lion-O, Panthro, and the ThunderKittens head to the Churning Rocks and confront Mumm-Ra, who is again in the form of Jaga.
1144"Return to Thundera! Part IV"Peter LawrenceSeptember 7, 1989 (1989-09-07)114114
Mumm-Ra sends Ma-Mutt, disguised as Mandora, to free the Mutants from Captain Bragg's circus train and sends Bragg and Crowman falling into deep space. The Mutants are then ordered by Mumm-Ra to get rid of Tygra and Pumyra. The Mutants attack Snowman on Hook Mountain, Snowmeow gets Pumyra for help, and Tygra contacts the real Mandora to save Bragg and Crowman. Together, they recapture the Mutants. Meanwhile, on New Thundera, the earthquake tremors grow worse and the new Cats' Lair collapses, trapping Snarf in the ruins. Lion-O uses the sword to contact the other ThunderCats and they rush to Cats' Lair to save Snarf.
1155"Return to Thundera! Part V"Peter LawrenceSeptember 8, 1989 (1989-09-08)115115
After another earthquake – caused by Mumm-Ra – ruins the new Cats' Lair construction site, the ThunderCats go to see Jaguara and confront Mumm-Ra. Unfortunately, Mumm-Ra puts up a force-field over the Churning Rocks' entrance. Jaga appears to Lion-O and tells him to use the Eye of Thundera to get to Jaguara and the Gyroscope. Lion-O does so and battles Mumm-Ra, who throws him into the bottomless pit underneath the Gyroscope. Lion-O, however, manages to throw his grappling hook to the top, pulling him back up. Lion-O shines the signal and it goes through the force-field. All the ThunderCats leap through the signal, which takes them through the force-field. Together, they fire all their weapons at Mumm-Ra, and he is defeated. Before leaving, Mumm-Ra breaks the cord that holds the Gyroscope above the pit and it falls through. Now, New Thundera is literally falling apart.
1166"Leah"J. Larry Carroll
and David Carren
September 11, 1989 (1989-09-11)116116
The Ancient Spirits of Evil bring the Mirror Wraith to Mumm-Ra, and he disguises it as a child's toy. Mumm-Ra then intercepts a Thunderian escape pod carrying a little girl, Leah. He gives the toy to Leah, and leaves. She is rescued by the ThunderCats, and goes into New Cats' Lair with the doll.
1177"Frogman"Kimberly MorrisSeptember 12, 1989 (1989-09-12)117117
Wilykit and Wilykat are constructing a well for the New Cats' Lair on New Thundera. The ThunderCats on New Thundera receive a distress signal from Thunderian refugees trying to find their way to New Thundera. The ThunderKittens are left alone with Snarf at the New Cats' Lair, and Lion-O and Snarfer are out constructing an early warning device. The rest of the ThunderCats seek out the refugees in space. When Wilykit and Wilykat strike water, they accidentally unleash a monster that Jaga trapped in an underground lake centuries ago.
1188"The Heritage"Bill Ratter and
Peter Lawrence
September 13, 1989 (1989-09-13)118118
Exploring New Thundera, Wilykit and Wilykat stumble upon a golden orb and pick it up, thinking that it is a part of their Thunderian heritage. Possessed by the power of the Golden Sphere of Seti, the ThunderKittens get greedy, and let the power of the orb overcome them. Mumm-Ra manages to get a hold of the orb, and his powers get four times more powerful.
1199"Screwloose"William OvergardSeptember 14, 1989 (1989-09-14)119119
Jaguara cannot work New Thundera's Gyroscope on her own, so the ThunderCats order a robot to aid her in running it. Screw Loose, a robot who specializes in gyroscopes, comes to New Thundera. Mumm-Ra manages to mess up Screw Loose's brain and he becomes destructive instead of helpful. The ThunderCats must help Jagara get Screw Loose under control, before the entire planet is destroyed.
12010"Malcar"George Hampton
and Mike Moore
September 15, 1989 (1989-09-15)120120
Mumm-Ra raises Malcar, an ancient alchemist, from the dead. However, the alchemist is old and weak, so Mumm-Ra must restore his youth and power. Malcar regains his powers and uses them against the ThunderCats.
12111"Helpless Laughter"Matthew MalachSeptember 18, 1989 (1989-09-18)121121
A convergence of the Moons of Plun-darr causes a drought on Thundera. Panthro and Snarf go looking for water, then Ezuka – the flying Serpent of Dreary Canal – wanting to get water itself, attacks Panthro and Snarf, causing them to fall into the Swamp of the Laughing Lilypads, and making them laugh uncontrollably. Ezuka attacks the Cats' Lair, still looking for water. Lion-O uses the Sword of Omens to make some rain, and he and Bengali use The ThunderStrike to melt some ice. However, Mumm-Ra comes along and causes a flood.
12212"Cracker's Revenge"William OvergardSeptember 19, 1989 (1989-09-19)122122
Captain Cracker and his mechanical parrot Polly land on Way-Out Back, free the Lunatacs, and put Bragg and Crownan in one of the train's cages. They plan to go to Third Earth to attack it, since most of the ThunderCats are no longer there. Meanwhile, the ThunderCats learn that Cracker has escaped and Snarfer and Mandora go to catch him. Bragg has Crownan ride a fire extinguisher, so he can get into space and get help. Mandora finds him, and the three of them go to Third Earth. Mandora fights with Cracker and the Lunatacs, but is beaten; she and Snarfer are tied to her cycle and sent towards a mountain. Lion-O, Panthro, and Cheetara arrive, and Lion-O saves Mandora and the others. Meanwhile, Cracker and the Lunatacs go to attack Cats' Lair.
12313"The Mossland Monster"Chris TrengoveSeptember 20, 1989 (1989-09-20)123123
Tygra, on a solo trip to New Thundera to meet the other ThunderCats, decides to take a shortcut through a meteor shower. His ship is damaged, and he lands on an unexplored region of New Thundera: The Moss-Land. It turns out that the moss in Moss-Land is part of a giant monster. The Moss Monster captures Tygra with its moss. Lion-O and Bengali set out to save Tygra and battle the Moss Monster.
12414"Ma-Mutt's Confusion"Beth BornsteinSeptember 21, 1989 (1989-09-21)124124
Mumm-Ra has a new device, the Babylonian Barbarian Boiler, that he plans to use on Cats' Lair. Ma-Mutt fools around too much and Mumm-Ra banishes him from the Pyramid. Later, the ThunderKittens, Snarf, and Snarfer bring Ma-Mutt back to Cats' Lair. Mumm-Ra fires the Boiler's beam at the Cats' Lair, which causes it to start melting. Snarfer makes a communicating device – Ma-Mutt was trying to tell them about the Boiler's beam – so they can understand Ma-Mutt. Ma-Mutt starts telling them about the Boiler, but Mumm-Ra sees this; through the Cauldron's magic, he brings Ma-Mutt back to the Pyramid.
12515"Shadowmaster"Dennis J. WoodyardSeptember 22, 1989 (1989-09-22)125125
From the Shadow Realm, the Shadowmaster contacts the Ancient Spirits of Evil, telling them how he captured Lion-O's father, Claudus, just before Thundera blew up. The Shadowmaster, through a bad dream, shows Lion-O his captured father and challenges Lion-O to a fight. Lion-O goes to the Shadow Realm through the Book and Sword of Omens, and is able to fight the Shadowmaster as long as the Sword stays bonded to the book. However, the Shadowmaster sends a huge bat to steal the Sword. It succeeds, and then Lion-O becomes very weak in the Shadow Realm. Mumm-Ra, meanwhile, feeling like the Spirits will turn against him in favor of the Shadowmaster, sends Ma-Mutt to secretly steal the sword from the bat and put it back near the book. This will be crucial to Lion-O's triumph in the Shadow Realm.
12616"Swan Song"William OvergardSeptember 25, 1989 (1989-09-25)126126
An Ecology Inspector comes to New Thundera to inspect the New Cats' Lair. His ship uses the Space Way Airborn Navigations (SWAN) system to direct him to planets all over the universe. When he arrives on New Thundera, he gets ambushed by Two-Time. Two-Time uses a hologram to make the Inspecotor's ship crash into a mountain, and when the ThunderCats come to rescue the Inspector in the Feliner, Two-Time uses the hologram again. Lion-O manages to fly around the mountain and lands the Feliner. Meanwhile, Two-Time flies to New Cats' Lair in his spaceship, Dome-Down. He picks up the whole Lair and keeps it inside Dome-Down.
12717"Touch of Amortus"Bill RatterSeptember 26, 1989 (1989-09-26)127127
Mumm-Ra orders Amortus, a being he banished to the Land of No Return centuries earlier, to destroy Lynx-O. Amortus makes Lynx-O crash in the ThunderStrike, and then he touches Lynx-O's face. The spell from the touch makes Lynx-O feel like he is an outcast, so he leaves to join Amortus in the Land of No Return. Lion-O, Panthro, and Cheetara go after him. In the Land of No Return, Amortus again touches Lynx-O, this time causing him to turn to stone. The other ThunderCats arrive and try to beat Amortus, but he touches all of them, causing them to start turning to stone. Just as Lion-O is about to turn entirely to stone, he calls the Sword and it breaks them free.
12818"The Zaxx Factor"Matthew MalachSeptember 27, 1989 (1989-09-27)128128
Vultureman escapes from exile by hijacking a bookmobile. He finds a disk containing ancient history about two powerful evil forces on Third Earth: Mumm-Ra and his enemy Zaxx. Using this information, Vultureman plots to defeat Mumm-Ra and rule the universe.
12919"Well of Doubt"Dennis J. WoodyardSeptember 28, 1989 (1989-09-28)129129
The ThunderCats use a new Tower signal to guide a Thunderian ship in; aboard are Baron Tass and Mr. Grubber, a devious pair of Thunderians. Later, Lion-O sends Torr, Baron Tass and Mr. Grubber to get water. On the way, the Baron stops at the Well of Doubt and gets some of its water, which causes a person to become very doubtful of his own abilities. When they get back to the ThunderCats, Baron Tass gives some of the water to Lion-O. On the way to inspecting the new Tower in the Whisker, Lion-O feels the effects of the water and causes the Whisker to crash. Tass comes back after getting his Guardsman – giant stone-men – and has them attack the ThunderCats.
13020"The Book of Omens"William OvergardSeptember 29, 1989 (1989-09-29)130130
Finally, Panthro deciphers how to use the Key of Omens. He enters the code to open the lock and the Guardian of Omens is suddenly summoned. It tells the ThunderCats they have twenty-four hours to present both the Key and four other items to the four places in disgrace – i.e., plagued by geological disasters – all over New Thundera. Everything was proceeding correctly except for the Key, which Mumm-Ra stole. However, Mumm-Ra enters the Book of Omens just when Lion-O finds him, and they battle inside the Book. This presented a satisfying finale for the complete series, albeit one with an open ending.


  1. ^ "The Tampa Tribune". January 20, 1985.
  2. ^ "TV, Radio & Cable Week", January 27, 1985, page 27. The Journal News
  3. ^ a b c d Listed in chronological order as re-aired on Cartoon Network.
  4. ^ The ThunderCats - The original group consisting of the young Lion-O, Tygra, Cheetara, Panthro, Wilykit, Wilykat, Snarf and Jaga – who later appears only in spirit form after the first episode.
  5. ^ Thundera - Homeworld of the Thunderians and the ThunderCats, it was destroyed at the beginning of the series.
  6. ^ The Mutants - The original mutant group, led by Slithe, with his henchmen Monkian and Jackalman, in charge of various nameless reptilian, Monkian and Jackalmen underlings).
  7. ^ Third Earth - The home planet of a wide variety of sentient and non-sentient beings of both native and alien origins. It became the home of the ThunderCats after Thundera was destroyed and is the setting for most of the series.
  8. ^ Sword of Omens - A mystic sword originally carried by Jaga, which he then passed on to Lion-O shortly before his death.
  9. ^ The Black Pyramid - Home of Mumm-Ra, the Ever-Living. The Pyramid contains Mumm-Ra's sarcophagus, magic pool, and the statues of the Ancient Spirits of Evil.
  10. ^ Eye of Thundera - The source of the Thundercats power, it is embedded in the Sword of Omens. It awakens when summoned by Lion-O and appears as a black cat's head against a red background.
  11. ^ ThunderTank - The ThunderCats main vehicle, constructed by Panthro early in the series from the remains of their wrecked spaceship. It is a rugged all-terrain vehicle with many attachments including a drill, claws, and a crushing mouth.
  12. ^ a b Ro-Bear Berbils - A race of small robotic bears from the planet Ro-Bear, also stranded on Third Earth, who are regular allies of the ThunderCats and help them build their lair.
  13. ^ Trolligs - A race of Bulldog-faced creatures who frequently raid the Berbil village to steal their fruit.
  14. ^ Giantorrs - A race of giants who live on top of the Trollig's mountain where the trollberry bushes grow. They refuse to let the Trolligs eat the leaves off those bushes unless they bring them Ro-Bear Berbil fruit. After the ThunderCats drive the Trolligs and Giantorrs off, the Berbils become their allies and offer to help them build their new home.
  15. ^ Cats' Lair - The name of the ThunderCats' home and fortress on Third Earth, a replica of the one on Thundera, it was designed by Tygra and built quickly with the help of the Berbils.
  16. ^ Brute-Men - A tribe of unintelligent, anthropomorphic bovine-like creatures. Although normally docile, they can make violent and powerful opponents when angered.
  17. ^ Castle Plun-darr - The name of the Mutants' home-base on Third Earth, a towering fortress with a massive winged gargoyle, it was built with the slave labor of the Brute-Men.
  18. ^ Berzerkers - Originally a bloodthirsty Viking pirate crew, captained by Hammerhand; they were later reformed and mechanized to include Cruncher, Ram-Bam, and Top-Spinner as well.
  19. ^ Unicorn Keepers - A male and female pair with moon-shaped scepters and star tattoos on their faces; they are the guardians of the rare Unicorns who live in the Unicorn Forest and act as keepers of the crystal of the Bridge of Light.
  20. ^ The Warrior Maidens - Strong, Amazonian-like women who live in the Treetop Kingdom. Led by Willa, they are frequent allies of the Thundercats on Third Earth.
  21. ^ a b c Thundrylium - a mineral that occurs on Third Earth, Thundera and other planets that the ThunderCats and Lunataks alike use for fuel.
  22. ^ Wolos - A small people that live peacefully on Third Earth, resembling anthropomorphized badgers.
  23. ^ Molemen - Small, skittish, unfriendly, mole-like creatures found wandering around the tunnels of Third Earth. They were known to be slaves of the Molemaster.
  24. ^ Mudhogs - Pig-like sentient species who live underground on Third Earth. They communicate through snorting and are ruled by their Mudhog King.
  25. ^ Bolkins - A timid, sheep-like sentient species on Third Earth, similar in appearance and manner to the Wolos.
  26. ^ a b Suspension Capsule - stasis pods which the ThunderCats used on their journey from Thundera to Third Earth so they would not age.
  27. ^ "The Pantagraph". September 27, 1986.
  28. ^ a b c d e Thundranium (known as "fire rocks" on Third Earth) - a mineral that weakens Thunderians, and can eventually kill them. (Analogous to Superman and Green Kryptonite)
  29. ^ Dark Side - Forbidden territory to ThunderCats and Mutants alike because of the danger there. When the Lunatacs came to Third Earth years earlier and tried to destroy Mumm-Ra, he imprisoned them there.
  30. ^ "Fort Worth Star-Telegram". September 13, 1987.
  31. ^ a b c Treasure of Thundera/ThunderCats - A collection of magic objects with various powers, the most important being the Book of Omens.
  32. ^ a b Book of Omens - This book contains the secrets of the ThunderCats
  33. ^ In the previous episode, Cheetara, Tygra, Panthro, Snarf, and Snarfer all became younger after being tricked into entering the Valley of Youth.