Terry-Thomas as Capt. J. (Jeroboam) Barker-Rynde PI

Eric Sykes as Rumbelow

Lionel Jeffries as Det. Insp. Hook

Dennis Price as Dr. Julian Crossley

Moira Redmond as Frances Roitman

David Lodge as Richards

Ronnie Barker as Burton

Derren Nesbitt as Roger Forrester

Anna Russell as Mrs. Margaret Clifford

Julian Orchard as PC Lofthouse

Katya Douglas as Rita

Harry Locke as Higgins

Peter Butterworth as Barman