| Harvey Ashby | ... | George Harbinger | |
| Roger Ashton-Griffiths | ... | Ivan | |
| Charles Dance | ... | Harry Maxim | |
| Constantine Gregory | ... | Komoscin | |
| George Howell | ... | Det. Con. Phillips (1984) | |
| Harry Jones | ... | Charley Farthing | |
| Jill Meager | ... | Agnes Algar | |
| Dan O'Herlihy | ... | Prof. John Tyler |
Directed by | |||
| Alastair Reid | |||
Writing credits(in alphabetical order) | ||
| Brian Clemens | ||
| Gavin Lyall | book "The Secret Servant" | |
Produced by | |||
| Robert McIntosh | .... | producer (as Bob McIntosh) | |
Sound Department | |||
| Brian Milliken | .... | boom operator | |
Special Effects by | |||
| Graham Brown | .... | special effects (1984) | |
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| The Watcher in the Woods | "The Professionals" | Dr. Jekyll and Mr. Hyde | "Bugs" | Captain Kronos - Vampire Hunter |
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| Full cast and crew | Company credits | IMDb TV section |
| IMDb UK section |
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