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The Mutant Phase

The Mutant Phase is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who. It forms the third serial in the Dalek Empire arc, following on from events in The Genocide Machine and The Apocalypse Element. The arc concludes in The Time of the Daleks. This audio drama is based on an earlier Audio Visuals story of the same name.

The Mutant Phase
Album cover
Big Finish Productions audio drama
SeriesDoctor Who
Release no.15
FeaturingFifth Doctor
Written byNicholas Briggs
Directed byNicholas Briggs
Produced byGary Russell
Jason Haigh-Ellery
Executive producer(s)Jacqueline Rayner
Production code6CC
Length2 hrs, 1 min
Release dateDecember 2000
Preceded byThe Holy Terror
Followed byStorm Warning

A director's cut of the first episode was included with the Doctor Who Magazine bonus CD story Cuddlesome.



The Fifth Doctor and Nyssa discover that even the Daleks have foes that they fear as a paradox threatens to destroy the universe... but are the Daleks the threat or the cure?



  • This story forms the third serial in the Dalek Empire arc, a storyline that started with the Seventh Doctor (The Genocide Machine) and Sixth Doctor (The Apocalypse Element) and concludes with the Eighth (The Time of the Daleks). Elements from these stories tie in with the Dalek Empire series.
  • Some of the action of this story takes place during the Dalek invasion of Earth in the 22nd century, which was originally depicted in the First Doctor serial The Dalek Invasion of Earth. The plan to remove the Earth's core is mentioned, as well as the mine works in Bedfordshire. The date of this story is given as 2158; the television serial, which has yet to occur, takes place in or around 2164.
  • The Doctor and Nyssa briefly discuss the fact that this is Nyssa's first encounter with the Daleks, because she never encountered them during any of her appearances in the television series.
  • Commander Ganatus and the Starship Dyoni are named after the Thal characters from The Daleks.

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