Erik Rolf

as Mr. Simms

as John

as Smiley Slade (uncredited)

as Jan Van Steen

as Johansen (uncredited)

as Dr. Henry Talbot

as Fred Stevens

as Ben Royall

as Kapitaen Ganz, The U-Boat Captain

as Lucklow (uncredited)

as Karl Grimm

as Dooley Watson