Numbers (season 2)

The second season of Numbers, an American television series, premiered on September 23, 2005 and its season finale was on May 19, 2006. Season two sees several changes to Don's FBI team: Terry Lake is reassigned to Washington DC and two new members join Don and David Sinclair: Megan Reeves and Colby Granger. Charlie is challenged on one of his long-standing pieces of mathematical work and also starts work on a new theory, Cognitive Emergence Theory. Larry sells his home and lives a nomadic lifestyle, while he becomes romantically involved with Megan. Amita receives an offer for an assistant professor position at Harvard University, but is plagued by doubt as her relationship with Charlie is challenged and her career is in upheaval. Alan begins working and dating again, though he struggles with the loss of his wife.

Season 2
Numb3rs season 2 DVD.png
DVD cover
Country of originUnited States
No. of episodes24
Original networkCBS
Original releaseSeptember 23, 2005 (2005-09-23) –
May 19, 2006 (2006-05-19)
Season chronology
← Previous
Season 1
Next →
Season 3
List of Numbers episodes






No. in
TitleDirected byWritten byOriginal air dateProd.
US viewers
141"Judgment Call"Alex ZakrzewskiKen SanzelSeptember 23, 2005 (2005-09-23)20111.18[1]

When a judge's wife is shot dead while arriving into her parking garage, Don and his team look into the judge's cases to determine if one of his verdicts led to the murder.

First appearance of: Diane Farr as Megan Reeves and Dylan Bruno as Colby Granger

Mathematics used: Scatterplot, Bayesian Spam Filtering, Buffon's needle and Conditional Probability
152"Better or Worse"J. Miller TobinAndrew DettmanSeptember 30, 2005 (2005-09-30)20211.83[2]

Don and his team are called in when a woman attempting to rob a jewelry store in Beverly Hills is shot by a security guard.

Mathematics used: Von Neumann cellular automata, Farey sequence and pseudo-random numbers
163"Obsession"John BehringRobert PortOctober 7, 2005 (2005-10-07)20311.40[3]

The FBI becomes involved in the stalking of a popular singer after she is threatened by an intruder in her house and reveals a series of threatening letters she has received through the mail. Charlie receives an anonymous love letter from someone other than Amita.

Mathematics used: Trigonometry, curvelet analysis, Forensic Information System for Handwriting (FISH), spherical astronomy and art gallery problem
174"Calculated Risk"Bill EaglesJ. David HardenOctober 14, 2005 (2005-10-14)20411.09[4]

Don and Megan are called to the murder scene when the CFO of a powerful energy company—who was about to testify against her fellow executives—is murdered at her home and her son is the only witness.

Mathematics used: Conditional probability and compound interest
185"Assassin"Bobby RothNicolas Falacci & Cheryl HeutonOctober 21, 2005 (2005-10-21)20511.17[5]

Along with David Sinclair and new FBI Agent Colby Granger, Don discovers a secret code during a raid and enlists Charlie's help to crack it. Charlie cancels his date with Amita only to discover she already made other plans for that night.

Mathematics used: Transposition cipher, game theory and paper planes
196"Soft Target"Andy WolkDon McGillNovember 4, 2005 (2005-11-04)20611.13[6]

A week-long series of counter-terrorism exercises are put to the test by Homeland Security in Los Angeles, but the first one is violated by someone who releases a potentially lethal gas in the subway system. Alan hosts a wedding for a girl from the Eppes brothers' past.

Mathematics used: Percolation theory and diffusion
207"Convergence"Dennis SmithNicolas Falacci & Cheryl HeutonNovember 11, 2005 (2005-11-11)20712.36[7]

Don investigates a series of home invasions in which the thieves steal only high-end items from wealthy individuals. Meanwhile, an old adversary challenges Charlie's work.

Mathematics used: Group theory, data-mining, Fourier analysis, calendars, Three-dimensional trilateration, Set theory and projectile motion
218"In Plain Sight"John BehringJulie HébertNovember 18, 2005 (2005-11-18)20812.44[8]

Megan feels personally responsible for an agent's death following an explosion at a house where meth is being illegally produced and that the FBI targeted for a bust but the case takes a new direction after Charlie discovers that the drug kingpin was in the FBI office, looking for help in rescuing his supposedly kidnapped daughter.

Mathematics used: Flock behavior, steganography and matrices - error correction code
229"Toxin"Jefery LevyKen SanzelNovember 25, 2005 (2005-11-25)20912.67[9]

Don learns that someone is poisoning non-prescription drugs made by a leading pharmaceutical company after four people nearly die from the tampering.

Mathematics used: Information theory - information entropy, graph theory - Seven Bridges of Königsberg and soap bubble theory with Steiner tree
2310"Bones of Contention"Jeannot SzwarcChristos Gage & Ruth FletcherDecember 9, 2005 (2005-12-09)21012.53[10]

An archaeologist is killed in a museum, and the object she was studying is taken.

Mathematics used: Exponential decay and Voronoi diagram
2411"Scorched"Norberto BarbaSean CrouchDecember 16, 2005 (2005-12-16)21111.96[11]

An arsonist believed to be part of an extremist environmental group sets a fire at a car dealership that kills a salesman. The group's name is spray painted at the scene and is the fourth such fire, but the first to claim a life.

First appearance of: Sophina Brown as Bianca Styles, before she is cast as Nikki Betancourt in season five.

Mathematics used: Combustion and principal components analysis
2512"The OG"Rod HolcombAndrew DettmanJanuary 6, 2006 (2006-01-06)21213.93[12]

When Don and his team are called to the murder scene of a Los Angeles gang member, they learn the victim is a fellow agent who had been working undercover.

Mathematics used: Poisson distribution and social network analysis
2613"Double Down"Alex ZakrzewskiDon McGillJanuary 13, 2006 (2006-01-13)21312.98[13]

When the FBI is called to investigate a murder at a Los Angeles card club, it leads the agents to unravel a complicated card counting scheme involving a group of college students whose lives may now be at risk.

Mathematics used: Probability involving sampling without replacement, time series analysis and randomization
2714"Harvest"John BehringJ. David HardenJanuary 27, 2006 (2006-01-27)21413.22[14]

A South Asian teenager is found in the blood-spattered basement of an old downtown hotel where she was apparently being tortured. The investigation soon reveals that the girl, along with three other missing women, are victims of a black-market organ-harvesting scheme.

Mathematics used: Markov chain, ellipses and genetic variation
2815"The Running Man"Terrence O'HaraKen SanzelFebruary 3, 2006 (2006-02-03)21513.31[15]

A DNA synthesizer with the capability of customizing diseases is stolen from the campus where Charlie teaches, and Don figures the thieves may be terrorists out to start or advance a bio-warfare program.

Mathematics used: Benford's law, continued fraction, astronomy, and probability
2916"Protest"Dennis SmithNicolas Falacci & Cheryl HeutonMarch 3, 2006 (2006-03-03)21611.94[16]

A pedestrian is killed when a homemade bomb explodes under a car outside of a downtown Army recruiting center. The investigation reveals that a similar bombing occurred exactly 35 years ago at an ROTC office that killed two people. Things take a turn when Don discovers that his father was a member of an anti-war group believed to have been associated with the bombings.

Mathematics used: Graph theory, Ramsey numbers and recursive sequence
3017"Mind Games"Peter MarkleAndrew DettmanMarch 10, 2006 (2006-03-10)21711.67[17]

When the bodies of three illegal-immigrant women are found on government-owned land in a wilderness area, Don investigates and learns a psychic led the police to the crime scene after allegedly seeing visions of the bodies. Charlie becomes extremely annoyed after learning that Don is using the psychic's help to solve the case, maintaining that true psychics do not exist.

Mathematics used: Fokker-Planck equation and Binomial theorem
3118"All's Fair"Rob MorrowJulie HébertMarch 31, 2006 (2006-03-31)21812.09[18]

In an effort to find the murderer of an Iraqi woman, Don enlists the help of the victim's cousin, who lives in Los Angeles. Through her cousin, Don learns information about the woman's disturbing connection to Saddam Hussein, which could lead to her murderer. Meanwhile, Charlie reunites with an ex-girlfriend, a best-seller neuropsychologist.

Mathematics used: Density, Sudoku, logistic regression and game theory
3219"Dark Matter"Peter EllisDon McGillApril 7, 2006 (2006-04-07)21913.69[19]

As Don and his team investigate the motive behind two students's deadly school shooting, Charlie uses the school's radio frequency identification system to track the shooters's movements through the school's hallways. But the team are stunned when Charlie reveals that they're looking for a third shooter, someone with motive.

Mathematics used: RFID and optimization problem
3320"Guns and Roses"Stephen GyllenhaalRobert PortApril 21, 2006 (2006-04-21)22012.09[20]

When an ATF agent is found dead amid questionable circumstances, Don demands to take on the case, which revolves around an elaborate bank heist, after he learns the victim is his ex-girlfriend.

Mathematics used: Echolocation and biomathematics (DNA sequence alignment)
3421"Rampage"J. Miller TobinKen SanzelApril 28, 2006 (2006-04-28)22112.32[21]

After an unknown man opens fire in the FBI offices, causing carnage and destruction, Don and his team must investigate his motive and his connection to a dangerous arms dealer who is on trial. Meanwhile, Don soon learns that the bullet that killed the sex offender the team interviewed came from Colby's gun, forcing Colby to be put on desk duty for the time being.

Mathematics used: Chaos theory, Brownian Motion, Self-organized criticality, Venn diagram and tesseracts/hypercubes
3522"Backscatter"Bill EaglesNicolas Falacci & Cheryl HeutonMay 5, 2006 (2006-05-05)22212.01[22]

An FBI investigation into a computer hacking scam, which taps into a bank's system to gain access to customer's identities and financial assets, becomes personal for Don when the Russian mob spearheading it comes after him and threatens the safety of Charlie and Alan.

Mathematics used: Explicit and implicit functions, geometric progression and exponential growth. Neil Sloane's Integer Sequence Database was also used.
3623"Undercurrents"J. Miller TobinJ. David HardenMay 12, 2006 (2006-05-12)22312.35[23]

Five young Chinese girls wash up on the shore; while Charlie works out where they came from, it emerges that one of the girls is carrying Avian Flu.

Mathematics used: Encoding, vector fields, kinematics, n-dimensional space and strange loop.
3724"Hot Shot"John BehringBarry SchindelMay 19, 2006 (2006-05-19)22412.72[24]

Two women are found dead with an apparent drug overdose, in similar positions with a syringe in the left arm; Don suspects a serial killer. The investigation reveals valium (diazepam) and morphine. Charlie's help on Don's case is hindered by his bizarre dream about his mother.

Mathematics used: Directed graph, parabolic equations, probability and trajectory


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  21. ^ "Weekly Program Rankings". ABC Medianet. May 2, 2006. Retrieved February 10, 2010.
  22. ^ "Weekly Program Rankings". ABC Medianet. May 9, 2006. Archived from the original on July 28, 2014. Retrieved February 10, 2010.
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External linksEdit