The Doctor and Jo are taken to Earth, where both humans and Draconians believe them to be a spy for the other side.
| Name | Type | Role | |
|---|---|---|---|
| Malcolm Hulke | Writer | ||
| James Culliford | Guest Star | ||
| John Rees | Guest Star | ||
| Timothy Craven | Guest Star | ||
| Ray Lonnen | Guest Star | ||
| Lawrence Davidson | Guest Star | ||
| Peter Birrel | Guest Star | ||
| Karol Hagar | Guest Star | ||
| Paul Bernard | Director |