Back in the first half of the eighties, when the Soviet leadership was old, dementing and increasingly paranoid and president Reagan spoke of a winnable nuclear war and set in motion the Star Wars project to make it so, the nuclear holocaust was on many people's minds. It not only featured frequently in popular culture, but several films were made as explicit warnings of what a nuclear war would really be like. Of these movies, Threads (1984) was the most realistic and scary. The full movie is now available on Youtube for your "enjoyment". Warning: not very nice, sort of depressing. [more inside]
In 1965, Peter Watkins produced a fictional documentary called The War Game in which the aftermath of thermo-nuclear attacks in Britain was depicted. The BBC declared that it was "too horrifying for the medium of broadcasting" and was not aired until 1985. Watch it here (warning: graphic depictions of effects of radiation). Related, When the Wind Blows (parts 1 , 2, 3, 4, 5, 6, 7, 8), a sober animated tale of a British couple who try and survive nuclear holocaust based on the civil defense manual "Protect and Survive." (Previously).