Cast
- Peter Davison (The Doctor)
- Janet Fielding (Tegan Jovanka)
- Sarah Sutton (Nyssa)
- Matthew Waterhouse (Adric)
- Nicholas Briggs (Grand Marshall Xasslyr / Ice Warriors / Cybermen)
- Christopher Timothy (Professor Parry)
- Tamzin Outhwaite (Morton)
- Ronan Summers (Captain Hopper)
- Barbara Flynn (Professor Vansom)
- Belinda Lang (Revna Ulfsdottir)
- Matilda Tucker (Inga Kundsdottir)
Doctor Who - The Fifth Doctor Adventures
Doctor Who: The Fifth Doctor Adventures: Forty 1
Written by Matt Fitton Sarah Grochala
Starring Peter Davison Janet Fielding
