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Jennifer Hillary as Penny Bowers |
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Anthony Ainley as Bowers-One |
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Bernard Brown as Bowers-Two |
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Gerald Sim as Det. Sgt. Greene |
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Derek Benfield as Dr. Liam Moore |
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David Morrell as Sam Sheppard |
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Margaret Anderson as Sheila Sherwood |
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Alan Downer as John Sherwood |
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Pamela Craig as Miss Pringle |
| Writing | Moris Farhi | Writer |
| Directing | Eric Hills | Director |
| Production | Alan Bromly | Producer |
| Sound | John Baker | Original Music Composer |
| Writing | Roger Parkes | Script Editor |
| Editing | Dan Rae | Editor |
| Sound | Roger Roger | Theme Song Performance |
| Art | Sally Hulke | Production Design |
| Costume & Make-Up | Elizabeth Saville | Makeup Artist |
| Sound | John Staple | Sound |
