The Doctor and Jo land on a spaceship in the far future as it is attacked by Ogrons, which the human crew see as Draconians. The Doctor and Jo are taken to Earth as spies.
| Name | Type | Role | |
|---|---|---|---|
| Malcolm Hulke | Writer | ||
| Peter Birrel | Guest Star | ||
| Karol Hagar | Guest Star | ||
| James Culliford | Guest Star | ||
| Roy Pattison | Guest Star | ||
| John Rees | Guest Star | ||
| Louis Mahoney | Guest Star | ||
| Ray Lonnen | Guest Star | ||
| Paul Bernard | Director |