The Doctor and Jamie are taken captive by the Dominators and subjected to intelligence tests. Zoe heads to the Dulcian capital to request help, but the pacifist Dulcians are reluctant to act.
| Name | Type | Role | |
|---|---|---|---|
| Mervyn Haisman, Henry Lincoln | Writer | ||
| Ronald Mansell | Guest Star | ||
| John Cross | Guest Star | ||
| Walter Fitzgerald | Guest Star | ||
| Freddie Wilson | Guest Star | ||
| Alan Gerrard | Guest Star | ||
| Morris Barry | Director |