An Ice Warrior invasion fleet is on its way to the Moon. Meanwhile, the Doctor, Zoe & Jamie return to Earth by T-Mat, where the Doctor discovers there is only one way to destroy the fungal pods.
| Name | Type | Role | |
|---|---|---|---|
| Brian Hayles | Writer | ||
| Louise Pajo | Guest Star | ||
| Graham Leaman | Guest Star | ||
| Philip Ray | Guest Star | ||
| Peter Whitaker | Guest Star | ||
| John Witty | Guest Star | ||
| Ronald Leigh-Hunt | Guest Star | ||
| Hugh Morton | Guest Star | ||
| Tony Harwood | Guest Star | ||
| Sonny Caldinez | Guest Star | ||
| Steve Peters | Guest Star | ||
| Terry Scully | Guest Star | ||
| Alan Bennion | Guest Star | ||
| Michael Ferguson | Director |