Returning to the Moonbase, the Doctor confronts Slaar and the remaining Ice Warriors and must find a way of deflecting the invasion fleet that is heading towards them.
| Name | Type | Role | |
|---|---|---|---|
| Brian Hayles | Writer | ||
| Philip Ray | Guest Star | ||
| Louise Pajo | Guest Star | ||
| Ronald Leigh-Hunt | Guest Star | ||
| John Witty | Guest Star | ||
| Tony Harwood | Guest Star | ||
| Sonny Caldinez | Guest Star | ||
| Steve Peters | Guest Star | ||
| Graham Leaman | Guest Star | ||
| Alan Bennion | Guest Star | ||
| Michael Ferguson | Director |