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George Benson as Arnold Potterley |
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James Maxwell as Jonas Foster |
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David Langton as Thaddeus Araman |
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Willoughby Goddard as Ralph Nimmo |
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Sylvia Coleridge as Caroline Potterley |
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Shirley Cain as Miss Clements |
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Frances Alger as Laurel |
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Pat Gorman as Technician (uncredited) |
| Production | Irene Shubik | Producer |
| Production | George Spenton-Foster | Associate Producer |
| Directing | John Gorrie | Director |
| Writing | Jeremy Paul | Adaptation |
| Writing | აიზეკ აზიმოვი | Short Story |
| Art | Norman James | Production Design |
| Costume & Make-Up | Susan Wheal | Costume Design |
| Costume & Make-Up | Shirley Boakes | Makeup Artist |
| Sound | Brian Hodgson | Sound Effects |
| Crew | Bernard Wilkie | Special Effects |
| Sound | Norman Kay | Theme Song Performance |
| Writing | Irene Shubik | Story Editor |
| Sound | Dudley Simpson | Original Music Composer |
| Writing | Jeremy Paul | Writer |
