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Tom Baker as The Doctor |
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Elisabeth Sladen as Sarah Jane Smith |
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Ian Marter as Harry Sullivan |
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Wendy Williams as Vira |
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Kenton Moore as Noah |
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Richardson Morgan as Rogin |
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John Gregg as Lycett |
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Christopher Masters as Libri |
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Stuart Fell as The Wirrn |
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Nick Hobbs as The Wirrn |
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Gladys Spencer as High Minister (voice) |
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Peter Tuddenham as Voices on Nerva (voice) |
| Writing | Robert Holmes | Writer |
| Directing | Rodney Bennett | Director |
| Production | Philip Hinchcliffe | Producer |
| Writing | Robert Holmes | Script Editor |
| Visual Effects | John Friedlander | Visual Effects |
| Costume & Make-Up | Sylvia James | Makeup Artist |
| Lighting | Nigel Wright | Lighting Director |
| Sound | Dudley Simpson | Original Music Composer |
| Crew | Dick Mills | Special Sound Effects |
| Visual Effects | Tony Oxley | Visual Effects |
| Costume & Make-Up | Barbara Kidd | Costume Design |
| Art | Roger Murray-Leach | Production Design |
| Production | Marion McDougall | Production Assistant |
| Sound | John Lloyd | Sound |
| Production | George Gallaccio | Production Manager |
| Sound | Delia Derbyshire | Theme Song Performance |