The Doctor hatches a plan to intercept the Dominators' atomic seed pod as it is dropped into the planet's core. If he fails, the whole of Dulkis will be destroyed.
| Name | Type | Role | |
|---|---|---|---|
| Mervyn Haisman, Henry Lincoln | Writer | ||
| Freddie Wilson | Guest Star | ||
| Walter Fitzgerald | Guest Star | ||
| John Cross | Guest Star | ||
| Ronald Mansell | Guest Star | ||
| Morris Barry | Director |