Continuity
- 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.
Read more about this topic: The Mutant Phase
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