Invisible Agent (1942)

Invisible Agent (1942), an American action and spy film directed by Edwin L. Marin with a screenplay written by Curt Siodmak, follows the story of Frank Griffin Jr. He is the grandson of the original Invisible Man, who now operates a print shop in Manhattan using the name Frank Raymond. Late one night, four armed individuals enter his shop and reveal their identities as foreign agents working for the Axis powers. Among them are Conrad Stauffer, an S.S. lieutenant general, and Baron Ikito, a Japanese agent. They demand to obtain the invisibility formula and threaten harm if it is not handed over. Despite managing to flee with the formula, Griffin is still being pursued by these agents. As tensions rise after the Attack on Pearl Harbor, he ultimately agrees to share limited cooperation with U.S. government officials on one condition: that the formula can only be used on himself.

Later, while on a secret mission parachuting behind enemy lines, the protagonist injects himself with a serum to become invisible. The German troops tracking his descent are both shocked and confused when he lands in full view of them, before promptly shedding all of his clothing. After evading the troops, the protagonist seeks guidance from an unexpected source – Arnold Schmidt, an old coffin-maker. Schmidt reveals Griffin’s next task: obtaining a list of enemy spies within the U.S., currently held by Stauffer. Luckily, Griffin receives assistance from Maria Sorenson, a German spy who is also romantically involved with both Stauffer and Gestapo Standartenführer Karl Heiser. Their plan involves Sorenson attempting to gather information from Heiser during a private dinner, with Griffin as an unseen witness.