Charlie Chaplin - comic, filmmaker, and raconteur - didn't become the world's biggest star by courting controversy, but when he comes face-to-face with the horrors of Hitler, he feels compelled to get off the sidelines and get involved. And then Charlie is approached by FDR himself with a special assignment. His mission, if he chooses to accept it: create a propaganda film to drum up public support for joining the war in Europe.
And so Charlie goes from movie maker to provocateur, traveling the world and dodging danger to complete his film. With the help of undercover agent Hedy Lamar, her handler Errol Flynn, and British patriot Alfred Hitchcock, Chaplin faces down American fascists, Nazis spies, and his own massive self-doubt to complete his masterpiece.
But just because the film is done doesn't mean the mission is, and little tramp and great dictator go toe-to-toe, Charlie and Adolph, one-on-one, mano a mano in a rip-roaring climax that fully delivers on the promise of the premise.