| Cast list | | Joan Crawford | as | Dr. Brockton | | Michael Gough | as | Sam Murdock | | Bernard Kay | as | Inspector Greenham | | Kim Braden | as | Anne Brockton | | David Griffin | as | Malcolm Travers | | John Hamill | as | Cliff | | Thorley Walters | as | Magistrate | | Jack May | as | Dr. Selbourne | | Geoffrey Case | as | Bill | | Robert Hutton | as | Dr. Richard Warren | | Simon Lack | as | Colonel Vickers | | David Warbeck | as | Alan Davis | | Chloe Franks | as | Little Girl | | Maurice Good | as | Reporter | | Joe Cornelius | as | Trog |
| | Crew list: | | Freddie Francis (Director) | | Peter Bryan (Writer) | | John Gilling (Writer) |
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