Harry H. Corbett as Detective Sergeant Sidney Bung

Kenneth Williams as Dr. Olando Watt

Jim Dale as Albert Potter

Charles Hawtrey as Dan Dann

Fenella Fielding as Valeria Watt

Joan Sims as Emily Bung

Angela Douglas as Doris Mann

Bernard Bresslaw as Sockett

Peter Butterworth as Detective Constable Slobotham

Jon Pertwee as Dr. Fettle

Michael Ward as Mr. Vivian

Tom Clegg as Odbodd

Billy Cornelius as Odbodd Junior

Norman Mitchell as Cabby

Frank Thornton as Mr. Jones

Frank Forsyth as Desk Sergeant

Anthony Sagar as Policeman

Sally Douglas as Victim

Marianne Stone as Mrs. Parker

Denis Blake as Rubbatiti

Gerald Thomas as Odbodd Junior (voice) (uncredited)

Robert Vossler as Police Constable (uncredited)