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Jon Pertwee as The Doctor |
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Caroline John as Liz Shaw / Section Leader Elizabeth Shaw |
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Nicholas Courtney as Brigadier Lethbridge-Stewart / Brigade Leader Lethbridge-Stewart |
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John Levene as Sergeant Benton / Platoon Under Leader Benton |
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Olaf Pooley as Professor Stahlman / Director Stahlman |
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Christopher Benjamin as Sir Keith Gold |
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Sheila Dunn as Petra Williams / Dr Petra Williams |
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Derek Newark as Greg Sutton |
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David Simeon as Private Latimer |
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Derek Ware as Private Wyatt |
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Walter Randall as Harry Slocum |
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Ian Fairbairn as Bromley |
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Roy Scammell as RSF Sentry |
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Keith James as Patterson |
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Peter Thompson as Primord |
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Philip Ryan as Primord |
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Walter Henry as Primord |
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Pat Gorman as Primord |
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Dave Carter as Primord |
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Barry Letts as Loudspeaker Voice |
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Derek Martin as UNIT Soldier |
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Terry Walsh as UNIT Soldier |
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Ian Elliott as UNIT Soldier |
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Alan Chuntz as UNIT Soldier |
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Alan Clements as Technician Phillips |
| Writing | Don Houghton | Writer |
| Directing | Douglas Camfield | Director |
| Costume & Make-Up | Christine Rawlins | Costume Designer |
| Camera | Fred Hamilton | Camera Operator |
| Editing | Martyn Day | Editor |
| Costume & Make-Up | Marion Richards | Makeup Artist |
| Writing | Terrance Dicks | Script Editor |
| Sound | Delia Derbyshire | Music Score Producer |
| Sound | Ron Grainer | Music Arranger |
| Production | Barry Letts | Producer |
| Crew | Brian Hodgson | Special Sound Effects |
| Sound | Delia Derbyshire | Theme Song Performance |
| Visual Effects | Len Hutton | Visual Effects |
| Sound | Graham Hare | Sound |
| Directing | Barry Letts | Co-Director |
| Lighting | John Green | Lighting Director |
| Production | Chris D'Oyly-John | Production Assistant |
| Art | Jeremy Davies | Production Design |
| Crew | Derek Ware | Stunts |
| Crew | Roy Scammell | Stunts |
