Robert Beatty

Dr. Mark Benton

Elizabeth Sellars

Della Freeman

Peter Coke

Det. Insp. George Bellamy

Hugh Kelly

Dr. Craig

Vida Hope

Jackie Leroy

Janet Butler

Sister Rogers

Ferdy Mayne

Charles Constance

James Raglan

Supt. Grayson

Hugh Pryse

Mr. Rattray

George Benson

Prescott

Roger Delgado

Felix Galegos

Frank Atkinson

Railway Ticket Clerk (uncredited)

Donald Conlon

Helios Restaurant Patron (uncredited)

Arthur Dibbs

Helios Restaurant Patron (uncredited)

Robert Gregory

Man at Northolt Airport (uncredited)

Martyn C. Webster