Dr. Hawley Harvey Crippen

Donald Pleasence

Acting

Belle Crippen

Coral Browne

Acting

Ethel Le Neve

Samantha Eggar

Acting

R.D. Muir (as Sir Donald Wolfit)

Donald Wolfit

Acting

Captain McKenzie

James Robertson Justice

Acting

Mr. Tobin

Geoffrey Toone

Acting

Dr. Pepper

Douglas Bradley-Smith

Acting

Mrs. Clara Arditti

Olga Lindo

Acting

Mrs. Jackson

Elspeth March

Acting

Bruce Martin

Paul Carpenter

Acting

Chief Inspector Dew

John Arnatt

Acting

Lord Chief Justice

Oliver Johnston

Acting

Harry

John Lee

Acting

The Governor

Edward Underdown

Acting

Dr. Rogers

Hamilton Dyce

Acting

Mr. Arditti

Basil Henson

Acting

Miss Curnow

Totti Truman Taylor

Acting

Harding

Edward Cast

Acting

Chemist

Colin Rix

Acting

Police Sergeant Outside Courtroom (uncredited)

Terence Brook

Acting

Defence QC Clerk (uncredited)

Eric Dodson

Acting

Radio Officer Andrews (uncredited)

Max Faulkner

Acting

Ships Steward (uncredited)

Guy Standeven

Acting

Courtroom Spectator (uncredited)

John Tatham

Acting