The Doctor realises the freighter is now a huge bomb and sends it back through time where it can explode millions of years ago... but Adric is still aboard...
| Name | Type | Role | |
|---|---|---|---|
| Eric Saward | Writer | ||
| Clare Clifford | Guest Star | ||
| Beryl Reid | Guest Star | ||
| James Warwick | Guest Star | ||
| David Banks | Guest Star | ||
| Alec Sabin | Guest Star | ||
| Mark Hardy | Guest Star | ||
| June Bland | Guest Star | ||
| Peter Grimwade | Director |