- Margaret Rutherford
- Miss Jane Marple
- Lionel Jeffries
- Captain Sydney De Courcy Rhumstone
- Charles 'Bud' Tingwell
- Chief Insp. Craddock
- William Mervyn
- Comm. Breeze-Connington
- Joan Benham
- Matron Alice Fanbraid
- Stringer Davis
- Mr. Jim Stringer
- Nicholas Parsons
- Dr. Crump
- Miles Malleson
- Bishop Faulkner
- Henry Oscar
- Lord Rudkin
- Derek Nimmo
- Sub-Lt. Eric Humbert
- Gerald Cross
- Brewer (aka Lt. Commander Dimchurch)
- Norma Foster
- Asst. Matron Shirley Boston
- Terence Edmond
- Sgt. Bacon
- Francis Matthews
- Lt. Compton
- Lucy Griffiths
- Millie
- Bernard Adams
- Dusty Miller
- Tony Quinn
- Kelly - Tramp
- Edna Petrie
- Miss Pringle
- Billy Dean
- Police Constable
- Roy Holder
- Petty Officer Lamb
- Henry B. Longhurst
- Cecil Ffolly Hardwicke
- Colin McKenzie
- Officer
- Desmond Roberts
- Sir Geoffrey Bucknose
- Ivor Salter
- Police Sergeant
- Arnold Schulkes
- Officer
- Paddy Smith
- Steward
