Invisible Agent is a 1942 American action and spy film directed by Edwin L. Marin with a screenplay written by Curt Siodmak. The invisible agent is played by Jon Hall, with Peter Lorre and Sir Cedric Hardwicke as members of the Axis, and Ilona Massey and Albert Basserman as Allied spies. Plot Frank Griffin Jr, the grandson of the original Invisible Man, runs a print shop in Manhattan under the assumed name of Frank Raymond (Jon Hall). One evening, he is confronted in his shop by four armed men who reveal that they are foreign agents working for the Axis powers and they know his true identity. One of the men, Conrad Stauffer (Cedric Hardwicke), is a lieutenant general of the S.S., while a second, Baron Ikito (Peter Lorre), is Japanese. They offer to pay for the invisibility formula and threaten amputation of his fingers if it is not revealed. Griffin manages to escape with the formula. Griffin is reluctant to release the formula to the U.S. government officials, but following the Attack on Pearl Harbor agrees to limited cooperation (the condition being that the formula can only be used on himself). Later, while in-flight to be parachuted behind German lines on a secret mission, he injects himself with the serum, becoming invisible as he is parachuting down, to the shock and confusion of the German troops tracking his descent, and after landing strips off all of his clothing. Griffin evades the troops and makes contact with an old coffin-maker named Arnold Schmidt (Albert Basserman), who reveals the next step of Griffin's mission. Griffin is to obtain a list of German and Japanese spies within the U.S. in the possession of Stauffer. Griffin is aided in his task by Maria Sorenson (Ilona Massey), a German espionage agent and the love interest of both Stauffer and Stauffer's well-connected second-in-command, Gestapo Standartenführer Karl Heiser (J. Edward Bromberg). According to their plan, Sorenson attempts to gain information from Heiser during a private dinner, with Griffin as witness. Drunk from champagne, Griffin uses his invisibility to play tricks on Heiser instead. Finally enraged when the dinner table mysteriously tips and soils his uniform, Heiser places Sorenson under house-arrest. Later, an apologetic Griffin demonstrates his existence to Sorenson by putting on a robe and smearing facial cream on his features. The two are attracted to each other. Conrad Stauffer returns from his efforts in the