the omega man (1971)

Charlton Heston is the last man alive, surrounded by 'the family' a group of mutants who only come out at night. This has the same source book as The Last Man On Earth and I Am Legend. But in this biological warfare has devastated the world, leaving Heston as possibly the lone survivor wandering the deserted city looking for the family's hide out and also something to entertain himself with.
This is an entertaining version, not least because the mutants are reasoning human beings, all be it ones that have a warped sense of right and wrong! A vicious luddite religious cult out to exterminate all examples of science. Also the film has that early 70's hippie, blacksploitation vibe about it, that dates it but gives it an interesting style.