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Def-Con 4 is a 1985 post-apocalyptic film, portraying three astronauts who survive World War III aboard a space station and return to earth to find greatly changed circumstances.
(Summary from Wikipedia)
Virus (1980)
Threads (1984)
The Quiet Earth (1985)
Fail Safe (1964)
Def-Con 4 (1985)
Crack in the World (1965)
Last Woman on Earth (1960)
This Is Not a Test (1962)
A Boy and His Dog (1975)
Solarbabies (1986)
Meteor (1979)
Maggie (2015)
Day the World Ended (1955)
Miracle Mile (1988)
Stake Land (2010)
The Blood of Heroes (1989)
Robot Jox (1990)
Open Grave (2013)
The Last Man on Earth (1964)
Steel Dawn (1987)