The Invisible Man's grandson uses his secret formula to spy on Nazi Germany.
Ilona Massey
Maria Sorenson
Jon Hall
Frank Raymond
Peter Lorre
Baron Ikito
Cedric Hardwicke
Conrad Stauffer
J. Edward Bromberg
Karl Heiser
Albert Bassermann
Arnold Schmidt
John Litel
John Gardiner
Holmes Herbert
Sir Alfred Spencer
Keye Luke
Surgeon
Sven Hugo Borg
German Captain (uncredited)
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