Donald Pleasence

Dr. Hawley Harvey Crippen

Coral Browne

Belle Crippen

Samantha Eggar

Ethel Le Neve

Donald Wolfit

R.D. Muir (as Sir Donald Wolfit)

James Robertson Justice

Captain McKenzie

Geoffrey Toone

Mr. Tobin

Douglas Bradley-Smith

Dr. Pepper

Olga Lindo

Mrs. Clara Arditti