Griffith Jones

as Jimmy Dale

as Grigory Orlov

as Group Capt. Todd

as James Brodie

as Dr. Paul Martin

as Duncan

as Paul Beaumont

as Sir Jeremy

as Mark

as Chebutikin

as Sir Humphrey Maltravers

as Nikki

as Bryan Hodge

as Baines

as Sir Edgar Jones

as Lars Seelman

as Dr. Bellamy

as George Berry

as Sir George Davies

as Mr. Gryffyd

as Hintze

as Hintze (uncredited)