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Jon Pertwee as The Doctor |
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Roger Delgado as The Master |
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Katy Manning as Jo Grant |
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Edwin Richfield as Captain Hart |
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Clive Morton as Trenchard |
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June Murphy as 3rd Officer Jane Blythe |
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Donald Sumpter as Commander Ridgeway |
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David Griffin as Lt. Commander Mitchell |
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Hugh Futcher as Hickman |
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Royston Tickner as Robbins |
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Pat Gorman as Sea Devil |
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Peter Forbes-Robertson as Chief Sea Devil |
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Declan Mulholland as Clark |
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Alec Wallis as Ldg. Telegraphist Bowman |
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Brian Justice as Castle Guard Wilson |
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Terry Walsh as Castle Guard Barclay |
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Eric Mason as C.P.O. Smedley |
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Christopher Wray as Ldg. Seaman Lovell |
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Stanley McGeagh as Castle Guard Drew |
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Brian Vaughan as Lt. Commander Watts |
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Martin Boddey as Walker |
| Writing | Malcolm Hulke | Writer |
| Directing | Michael E. Briant | Director |
| Production | Barry Letts | Producer |
| Costume & Make-Up | Sylvia James | Makeup Artist |
| Sound | Malcolm Clarke | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
| Crew | Brian Hodgson | Special Sound Effects |
| Visual Effects | Peter Day | Visual Effects |
| Camera | Peter Sargent | Camera Operator |
| Editing | Martyn Day | Editor |
| Costume & Make-Up | Maggie Fletcher | Costume Design |
| Lighting | Mike Jefferies | Lighting Director |
| Sound | Tony Millier | Sound |
| Sound | Colin Dixon | Sound |
| Art | Tony Snoaden | Production Design |
| Writing | Terrance Dicks | Script Editor |