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Colin Baker as The Doctor |
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Bonnie Langford as Mel Bush |
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Michael Jayston as The Valeyard |
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Lynda Bellingham as The Inquisitor |
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Honor Blackman as Professor Sarah Lasky |
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Michael Craig as Commodore Travers |
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Denys Hawthorne as Rudge |
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Yolande Palfrey as Janet |
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Malcolm Tierney as Doland |
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David Allister as Bruchner |
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Tony Scoggo as Grenville |
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Arthur Hewlett as Kimber |
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Simon Slater as Edwardes |
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Sam Howard as Atza |
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Leon Davis as Ortezo |
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Hugh Beverton as First Guard |
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Barbara Ward as Mutant / Ruth Baxter |
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Mike Mungarvan as Duty Officer |
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Martin Weedon as Second Guard |
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Peppi Borza as First Vervoid |
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Bob Appleby as Second Vervoid |
| Directing | Chris Clough | Director |
| Writing | Jane Baker | Writer |
| Writing | Philip Baker | Writer |
| Production | John Nathan-Turner | Producer |
| Writing | John Nathan-Turner | Script Editor |
| Sound | Malcolm Clarke | Original Music Composer |
| Camera | Alec Wheal | Camera Supervisor |
| Costume & Make-Up | Andrew Rose | Costume Design |
| Art | Dinah Walker | Production Design |
| Costume & Make-Up | Shaunna Harrison | Makeup Artist |
| Production | Jane Wellesley | Production Assistant |
| Production | Ian Fraser | Production Manager |
| Crew | Dick Mills | Special Sound Effects |
| Lighting | Don Babbage | Lighting Director |
| Sound | Brian Clark | Sound |
| Visual Effects | Danny Popkin | Visual Effects |
| Editing | Hugh Parson | Editor |
| Visual Effects | Kevin Molloy | Visual Effects |
| Sound | Dominic Glynn | Theme Song Performance |
| Writing | Eric Saward | Script Editor |
