 | Michael York als Peter Strange |
 | Jeremy Kemp als Det. Sgt. Pierce |
 | Susan George als Frederika March |
 | Jack Watson als Quince |
 | Nigel Davenport |
 | George Benson |
 | George A. Cooper als Supt. Kingsley |
 | Barry Fantoni |
 | Artro Morris |
 | Richard Pearson |
| Madge Ryan |
| George Selway |
| David Greene | Director |
| Brian Eatwell | Production Design |
| Derek Kavanagh | Production Manager |
| René Dupont | Associate Producer |
| Alex Thomson | Director of Photography |
| Brian Smedley-Aston | Editor |
| Herbert Smith | Camera Operator |
| Jack Causey | Assistant Director |
| Garth Inns | Special Effects |
| Stanley Mann | Producer |
| H.L. Bird | Sound Recordist |
| Sue Yelland | Costume Design |
| Oscar Saul | Writer |
| Franz F. Palmer | Cinematography |
| Eve Greene | Writer |
| Jerome Odlum | Writer |
| Nicholas Pollock | Art Direction |
| George Blackler | Makeup Artist |
| Bill Burgess | Boom Operator |
| Peta Button | Set Decoration |
| Stanley Mann | Writer |
| Bernard Toms | Novel |
| Howard Harrison | Producer |
