Earth's energy is being drained away by the new planet, Mondas, and faces destruction. Cybermen invade the base and threaten to convert the humans into creatures like themselves.
| Name | Type | Role | |
|---|---|---|---|
| Kit Pedler | Writer | ||
| Ellen Cullen | Guest Star | ||
| Steve Plytas | Guest Star | ||
| Gregg Palmer | Guest Star | ||
| Dudley Jones | Guest Star | ||
| Glenn Beck | Guest Star | ||
| Robert Beatty | Guest Star | ||
| Earl Cameron | Guest Star | ||
| Christopher Matthews | Guest Star | ||
| Alan White | Guest Star | ||
| Harry Brooks | Guest Star | ||
| David Dodimead | Guest Star | ||
| Derek Martinus | Director |