The Mutant Phase (audio story)

 was the fifteenth monthly Doctor Who audio story produced by Big Finish Productions the third of their "Dalek Empire" semi-linked stories.

It was one of the few non-original pieces of Doctor Who fiction published by Big Finish. It was in fact a remake of an unlicensed audio drama published by Audio Visuals.

This was, according to the fictional timeline, the first performed story to feature an encounter between either the Fifth Doctor or Nyssa and the Daleks.

Publisher's summary
In the 22nd century, the Daleks have occupied planet Earth. By the 43rd century, only a handful of humans survive. Still further into the distant future, a Thal scientist must choose whether to betray his heritage, or see the universe destroyed.

When the Doctor and Nyssa find themselves trapped in this deadly chain of events, they must decide who their real enemies are. What is certain, however, is that no matter where the Doctor turns... his arch enemies, the Daleks, will be waiting for him.

What could possibly be worse than that? The Mutant Phase...

Full audio
TheMutantPhase

Cast

 * The Doctor - Peter Davison
 * Nyssa - Sarah Sutton
 * Professor Ptolem - Christopher Blake
 * Commander Canatus - Jared Morgan
 * Albert - Andrew Ryan
 * Delores - Sara Wakefield
 * The Daleks - Alistair Lock & Nicholas Briggs
 * Dalek Emperor - Nicholas Briggs
 * Professor Karl Hendryk - Mark Gatiss

Daleks

 * The story occurs in the early part of the Dalek invasion and occupation of Earth in the 22nd century.
 * The Daleks use Robomen as guards in Kansas.
 * The Daleks count in Rels.

Species

 * Nyssa compares wasps on Earth to Lime Grove Wasps on Traken.
 * In the alternative timeline, the Thals provide the survivors on Earth with food.

TARDIS

 * Nyssa has been repairing the TARDIS' proximity alarm.
 * The Doctor uses the HADS to move the TARDIS.

Theories and concepts

 * The TARDIS is caught up in a damaged spatial temporal causal nexus point.
 * Meeting or communicating with one's past or future self is against the First Law of Time.

Time travel

 * When the TARDIS arrives, it hits a bump in the time track and is drawn down a time corridor.
 * Skaro is destroyed (in an alternative timeline).
 * The Daleks have time corridor technology.

Continuity

 * Nyssa refers to the events of AUDIO: The Land of the Dead.
 * This story takes place in an altered future after the events of TV: The Dalek Invasion of Earth.
 * The idea of the TARDIS jumping a time track was first seen in TV: The Space Museum.
 * Commander Ganatus and the Starship Dyoni are named after Thal characters from TV: The Daleks.
 * Nyssa would later encounter the Daleks in another alternative timeline (AUDIO: Renaissance of the Daleks) and in Stockbridge during the 45th century. (AUDIO: Plague of the Daleks) While a lone Dalek was present on Florana at the time that she, the Doctor and Tegan Jovanka visited the planet, Nyssa did not come into contact with it. (AUDIO: The Elite)
 * The Doctor remarks to the Dalek Emperor that they have both had a "face lift" since they last met during his second incarnation. (TV: The Evil of the Daleks)
 * Nyssa refers to the events surrounding Adric's death in 2526. (TV: Earthshock)
 * The Daleks possess bonded polycarbide armour. (TV: Remembrance of the Daleks)
 * The Dalek Emperor transfers himself into Ganatus' body in a fashion similar to Susan Mendes in 4177. (AUDIO: Dalek War: Chapter One)