The Doctor has escaped the catastrophic destruction of a parallel world. But can he stop Stahlman before he destroys this one?
| Name | Type | Role | |
|---|---|---|---|
| Don Houghton | Writer | ||
| Christopher Benjamin | Guest Star | ||
| Nicholas Courtney | Guest Star | ||
| Derek Newark | Guest Star | ||
| Olaf Pooley | Guest Star | ||
| Sheila Dunne | Guest Star | ||
| John Levene | Guest Star | ||
| Ian Fairbairn | Guest Star | ||
| Douglas Camfield | Director | ||
| Barry Letts | Director |