Survivors of a recent apocalyptic event struggle to survive. They face peril in the form of dangerous mutants, radiation poisoning, and romantic entanglements.
- Richard Denning as Rick
- Lori Nelson as Louise Maddison
- Adele Jergens as Ruby
- Mike Connors as Tony Lamont
- Paul Dubov - as Radek
- Paul Birch as Jim Maddison
- Paul Blaisdell as the Mutant
- Raymond Hatton as Pete
- Jonathan Haze as Contaminated Man
- Actor Mike Connors is credited as "Touch" Connors
- Day the World Ended is the film used in MST3K: The Home Game, a special presentation shown on The Sci-Fi Channel in advance of the premiere of Season 8. It has not been used in an official Mystery Science Theater 3000 project, or by any of the corollary productions.
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