 Laurence PayneNorman Martell | Norman Martell |
 Patricia DaintonHelen Martell | Helen Martell |
 Jane GriffithsPeggy Hill | Peggy Hill |
 Edward UnderdownDr. Peter Murdoch | Dr. Peter Murdoch |
 John ArnattSupt. Ross | Supt. Ross |
 Humphrey LestocqSimmons, the Producer | Simmons, the Producer |
 Lucy GriffithsMiss Potter | Miss Potter |
| OOlive MilbourneMrs. Booth | Mrs. Booth |
 Arthur HewlettMarshall | Marshall |
 Annette KerrCinema cashier | Cinema cashier |
 Cleo LaineCleo | Cleo |
 Dudley MooreRehearsal Pianist (Uncredited) | Rehearsal Pianist (Uncredited) |
| SSylvia DavisCinema sales girl (uncredited) | Cinema sales girl (uncredited) |
 Max FaulknerDet. Sgt. Fred Smith (uncredited) | Det. Sgt. Fred Smith (uncredited) |
| GGarard GreenPatrol car policeman (uncredited) | Patrol car policeman (uncredited) |
| AArthur HowellP.C. Williams (uncredited) | P.C. Williams (uncredited) |
| RRichard NellerSleeping Man in Theater (uncredited) | Sleeping Man in Theater (uncredited) |
 Pat RyanDetective Examining Tape-Recorder (uncredited) | Detective Examining Tape-Recorder (uncredited) |
 Stuart SaundersCinema manager (uncredited) | Cinema manager (uncredited) |
| AArthur SkinnerDet. Sgt. Carter (uncredited) | Det. Sgt. Carter (uncredited) |
| JJohn TathamDetective / Fingerprints Officer (uncredited) | Detective / Fingerprints Officer (uncredited) |
