"The Story of Mankind" - 1957

While this is Not a Marx Brothers Movie, It is the Last Movie Groucho, Harpo and Chico all appeared in.

The Devil and the Spirit of Man argue as to whether or not humanity is ultimately good or evil.

The Story of Mankind is a 1957 American dark fantasy film, loosely based on the nonfiction book The Story of Mankind (1921) by Hendrik Willem van Loon. The film was directed and coproduced by Irwin Allen and released by Warner Bros.

In the film, the fate of humanity is decided in a court of law. The Devil is the prosecutor, and the Spirit of Man acts as the defense lawyer. Historical figures and eras are used as evidence for and against humanity's right to salvation. The judge can not decide due to the fine balance between humanity's good and evil. So humanity is going to continue its struggle with itself.