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Tom Baker as The Doctor |
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Mary Tamm as Romana |
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John Leeson as K-9 (voice) |
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Cyril Luckham as The Guardian |
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Iain Cuthbertson as Garron |
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Nigel Plaskitt as Unstoffe |
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Paul Seed as Graff Vynda-K |
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Robert Keegan as Sholakh |
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Timothy Bateson as Binro |
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Anne Tirard as The Seeker |
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Prentis Hancock as Shrieve Captain |
| Writing | Robert Holmes | Writer |
| Directing | George Spenton-Foster | Director |
| Production | Graham Williams | Producer |
| Writing | Anthony Read | Script Editor |
| Sound | Dudley Simpson | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
