 | Frankie Howerd als Foster Twelvetrees |
 | Ray Milland als Stewart Henderson |
 | Hugh Burden als Reggie Henderson |
 | Kenneth Griffith als Ernest Henderson |
 | John Bennett als Patel |
 | Rosalie Crutchley als Jessica Henderson |
 | Ruth Dunning als Agnes Henderson |
 | Elizabeth MacLennan als Verity Henderson |
 | Aimée Delamain als Mother |
| Peter Munt als Cabbie |
| Clive Exton | Writer |
| Peter Sykes | Director |
| Terry Nation | Writer |
| Clive Exton | Producer |
| Terry Nation | Producer |
| Beryl Vertue | Executive Producer |
| Harry Robertson | Music |
| Ian Wilson | Director of Photography |
| Bill Blunden | Editor |
| Maurice Carter | Art Direction |
| Judy Moorcroft | Costume Design |
| Jill Carpenter | Makeup Artist |
| Ramon Gow | Hairdresser |
| Edward Joseph | Production Supervisor |
| Michael Dryhurst | Assistant Director |
| Andrew Campbell | Set Decoration |
| Ken Barker | Sound Recordist |
| Rene Borisewitz | Sound Recordist |
| Neil Binney | Camera Operator |
