The Doctor is trapped in a parallel world that is going up in flames. Can he escape in time to save Earth in his own universe?
| Name | Type | Role | |
|---|---|---|---|
| Don Houghton | Writer | ||
| Philip Ryan | Guest Star | ||
| Walter Henry | Guest Star | ||
| Nicholas Courtney | Guest Star | ||
| Peter Thompson | Guest Star | ||
| Derek Newark | Guest Star | ||
| Olaf Pooley | Guest Star | ||
| John Levene | Guest Star | ||
| Sheila Dunne | Guest Star | ||
| Pat Gorman | Guest Star | ||
| Dave Carter | Guest Star | ||
| Douglas Camfield | Director | ||
| Barry Letts | Director |