This film was directed by Edwin L. Marin, and the screenplay was written by Curt Siodmak, who had co-written the earlier The Invisible Man Returns in 1940. Siodmak was a refugee from Nazi Germany, and he gave the film a strong anti-Nazi tone that treated the Nazis as incompetent buffoons. (A scene reportedly edited from the film had the hero placing a boot into Hitler's backside, following an official ban on all such images.)