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William Hartnell as The Doctor |
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Jacqueline Hill as Barbara Wright |
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William Russell as Ian Chesterton |
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Maureen O'Brien as Vicki |
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Ray Barrett as Bennett / Koquillion |
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Tom Sheridan as Space Captain (voice) |
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John Stuart as Didonian (uncredited) |
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Colin Hughes as Didonian (uncredited) |
| Costume & Make-Up | Sonia Markham | Makeup Artist |
| Costume & Make-Up | Daphne Dare | Costume Design |
| Art | Raymond Cusick | Production Design |
| Writing | David Whitaker | Writer |
| Directing | Christopher Barry | Director |
| Writing | Dennis Spooner | Script Editor |
| Production | Mervyn Pinfield | Associate Producer |
| Production | Verity Lambert | Producer |
| Sound | Tristram Cary | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
