Forrest Tucker
— Baron Keller
Eva Bartok
— Baron Keller
Marius Goring
— Baron Keller
Guy Middleton
— Maj. Hobart
Eric Pohlmann
— Emile
Arnold Marlé
— Prof. Pal Kudnic
Fred Johnson
— Chief Agent Farquarson
David King-Wood
— Col. Patchway
Reginald Beckwith
— Dusty
Guido Lorraine
— Franz
Andre Mikhelson
— Russian thug answering Ludwigstrasse door
Stanley Zevic
— Russian thug #2 at Ludwigstrasse address
Marne Maitland
— The phony Kudnic
Arthur Lovegrove
— Bert
Derek Prentice
— Keller's butler