film summary
The Invisible Man's grandson uses his secret formula to spy on Nazi Germany in this comedy-thriller.

Frank Raymond, grandson of the original Invisible Man, still has the old formula but considers it too dangerous to use, even when Axis agents try to get it. But Pearl Harbor brings him to volunteer his own services as an invisible agent in Germany. Though a bit cold (clothes aren't invisible), his adventures are more comedy than thriller (with occasional grim reminders) as he makes fools of Nazi officials and romances a luscious double agent, in search of Hitler's secret plan...

A man who has inherited the formula for invisibility agrees to use his power to aid the allies during World War II.

This science fiction/spy thriller/wartime propaganda movie certainly isn't much of a science fiction movie; outside of the fact that we have a man who is invisible, it doesn't really use the idea in anything more than its gimmick capacity. It certainly isn't much of a spy thriller either; I prefer my spies to have a lot more common sense than this guy shows. In fact, the scene during the dinner, rather than being knee-slappingly funny as intended, merely makes me wonder why nobody bothered to administer an intelligence test to this guy before sending him out on a mission. This leaves the wartime propaganda angle as being where the movie is most effective, and it actually works well enough on that level, particularly during a scene where the Nazis try to get one of their prisoners to sign a paper claiming he was well treated; this ironic moment makes for propaganda as effective as it can be.

This is a tale of "intrigue and invisibility that gives the Allies a secret weapon during the heated battles of World War II." Jon Hall plays Frank Raymond who is the "secret weapon" since he becomes invisible when injected with a certain chemical. He takes his new ability and uses it to "bewilder the Nazis as well as the Japanese." He goes to "top-secret meetings, obtains confidential information and eventually blows the top off nasty Axis plans for an aerial attack on New York City!" He also finds time in between doing all that to fall in love for a double agent. "Inventiveness is the order of the day." Peter Lorre and Sir Cedric Hardwicke are touted as being in this film (probably against their wishes).