Invisible Agent is a 1942 American action and spy film directed by Edwin L. Marin with a screenplay written by Curt Siodmak.

[3][4] 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.

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.

Conrad Stauffer returns from his efforts in the United States and tries to manage his shifting alliances with Karl Heiser, Maria Sorenson, and Baron Ikito.

At the shop, Griffin confronts Maria Sorenson, whom he suspects has betrayed Schmidt, and is captured with a net trap by Ikito's men.

For their joint failure to safeguard the list of Axis agents, Ikito kills Stauffer and then performs seppuku, ritual suicide, as Heiser watches from the shadows.

The couple acquires one of the bombers slated for the New York attack, and destroy other German planes on the ground as they fly to England.

By 1942, the United States had entered World War II, leading studios to produce films that were described by the authors of the book Universal Horrors as replacing the "cynicism of the '30s" with the "flag-waving of the '40s".

[11] Kate Cameron of The New York Daily News found the film "amusing and exciting" with the actors performing "their supporting roles capably, although none of them tries to be convincing".

[11] Some sources commented on the politics and representation of the axis powers in the film, with an anonymous reviewer in Newsweek declared that Universal had "assembled a cast that is much too good for the nonsense on the agenda" and The Film Daily announcing that "this is the ordinary peace-time meller translated into wartime pattern [...] The nazis are made to look pretty stupid and beset with official rivalry, while the Japs appear like slippery villains of the old serial days".

[11] A reviewer from The Hollywood Reporter spoke on this, stating: "Possibly, the smartest thing about the picture is its consistent refusal to underrate the intelligence of the Gestapo and Rising Sun operatives.

[11] From retrospective reviews, the authors of Universal Horrors stated that the film was a "cut above average" for a war time genre film as well as "maddeningly uneven", and that "far and away the best thing about Invisible Agent is the casting of Sir Cedric Hardwicke and Peter Lorre as the representatives of the Axis", declaring them "casebook example of how a bit of stylish acting can transcend routinely written roles".

[4] Eder also praised Lorre while declaring the rest of the film as having "all manner of ludicrous dialogue and a few eye-popping special effects to carry the ridiculous plot and some occasionally wretched acting".