 | Shane Rimmer als John (voice) |
 | Sylvia Anderson als Julie (voice) |
 | Peter Dyneley als The Investigator (voice) |
 | Charles Thake als Stavros Karanti |
 | Peter Borg als Christoph |
| Gerry Anderson | Director |
| Gerry Anderson | Producer |
| Gerry Anderson | Creator |
| Sylvia Anderson | Screenplay |
| Shane Rimmer | Story |
| Vic Elmes | Music |
| John Cameron | Music |
| Harry Oakes | Cinematography |
| David Lane | Editor |
| Len Walter | Editor |
| Reg Hill | Modeling |