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Edward Judd as Dr. Mike Vernon |
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Yoko Tani as Leader of the Lystrians |
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Valerie Gearon as Dr. Claire Harland |
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Lyndon Brook as Brian Carter |
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Ric Young as The Lystrian |
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Tsai Chin as Nurse Lim |
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Barrie Ingham as Major Muncaster |
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Anthony Sharp as Lawrence Blackburn |
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Glyn Houston as Police Sergeant Draycott |
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Ann Castle as Sister Evans |
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Jean Lodge as Barbara Gough |
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Ann Martin as Sister Kelly |
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Tony Wall as Ted |
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Peter Thomas as Harry |
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Mark Kingston as Morgan |
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Emrys Leyshon as Sergeant Williams |
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Leonard Cracknell as Lloyd |
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Stephanie Bidmead as Elaine |
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Norman Mitchell as Lorry Driver |
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Peter Sinclair as Old Joe |
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Diane Aubrey as Telephone Operator |
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John Tate as Dundy |
| Directing | Alan Bridges | Director |
| Writing | Roger Marshall | Screenplay |
| Production | Jack Greenwood | Producer |
| Production | Ronnie Curtis | Casting |
| Sound | Brian Blamey | Sound Editor |
| Crew | Stan Shields | Special Effects |
| Camera | Peter Allwork | Camera Operator |
| Camera | James Wilson | Director of Photography |
| Costume & Make-Up | Eileen Welch | Costume Design |
| Editing | Derek Holding | Editor |
| Costume & Make-Up | Jean Bear | Hairstylist |
| Crew | Ronnie Whitehouse | Special Effects |
| Crew | Jack Kine | Special Effects |
| Costume & Make-Up | Benny Royston | Makeup Artist |
| Art | Scott MacGregor | Art Direction |
| Sound | Roy Norman | Sound Editor |
| Writing | Robert Holmes | Story |
| Sound | Bernard Ebbinghouse | Original Music Composer |
| Sound | Red Law | Sound Recordist |
