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.

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Quick Facts The Mutant Phase, Big Finish Productions audio drama ...

The Mutant Phase
Big Finish Productions audio drama
Series	Doctor Who
Release no.	15
Featuring	Fifth Doctor Nyssa
Written by	Nicholas Briggs
Directed by	Nicholas Briggs
Produced by	Gary Russell Jason Haigh-Ellery
Executive producer(s)	Jacqueline Rayner
Production code	6CC
Length	2 hrs, 1 min
Release date	December 2000
Preceded by	The Holy Terror
Followed by	Storm Warning

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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?

• The Doctor — Peter Davison
• Nyssa — Sarah Sutton
• Professor Ptolem — Christopher Blake
• Commander Ganatus — Jared Morgan
• Albert — Andrew Ryan
• Delores — Sara Wakefield
• Dalek Voices — Alistair Lock and Nicholas Briggs
• Professor Karl Hendryk — Mark Gatiss

• 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.

• In the Whovian timeline, this story takes place between Winter for the Adept and Primeval.

• Big Finish Productions – The Mutant Phase