Peace on Earth is a one-reel 1939 Metro-Goldwyn-Mayer cartoon short directed by Hugh Harman, about a post-apocalyptic world populated only by animals, after human beings have gone extinct due to war.

Through flashbacks, he remembers them only as monsters with flashing eyes and long snouts (gas masks), carrying shooting-irons with knives on the end (bayonets).

[3] This post-World War II version of the film, entitled Good Will to Men, is narrated by a deacon mouse who tells the story to a choir of mice preparing for a Christmas service.

Good Will to Men featured updated and even more destructive forms of warfare technology such as flamethrowers, bazookas and missiles, and instead of the final battle being man-to-man, humanity is driven to extinction by a mutually assured nuclear holocaust.

Both Peace on Earth and Good Will to Men are included, digitally restored and uncut, on the Warner Bros. Home Entertainment Academy Awards Animation Collection DVD set.