The Doctor and Zoe penetrate the Aliens' HQ from where the war games are controlled. Carstairs is reconditioned and exposes the Doctor and Zoe as German spies. Vintage sci-fi taking us on adventures in time and space, reflecting the broadcast standards and attitudes of its time.
| Name | Type | Role | |
|---|---|---|---|
| Malcolm Hulke, Terrance Dicks | Writer | ||
| Vernon Dobtcheff | Guest Star | ||
| Rudolph Walker | Guest Star | ||
| John Atterbury | Guest Star | ||
| Bill Hutchinson | Guest Star | ||
| Terry Adams | Guest Star | ||
| David Maloney | Director |