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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)
Steel Dawn (1987)
Maggie (2015)
The Last Man on Earth (1964)
Crack in the World (1965)
The Quiet Earth (1985)
Def-Con 4 (1985)
Threads (1984)
Stake Land (2010)
A Boy and His Dog (1975)
Open Grave (2013)
Robot Jox (1990)
Meteor (1979)
Fail Safe (1964)
Day the World Ended (1955)
The Blood of Heroes (1989)
Miracle Mile (1988)
Solarbabies (1986)
Last Woman on Earth (1960)
This Is Not a Test (1962)