In the UK this was originally released as The Aftermath, but a few years later it was re-released on VHS under the title Zombie Aftermath, however this is NOT a zombie movie.
Two astronauts land back on Earth in their cheap looking spacecraft only to find themselves in a post nuclear aftermath. There are only a few survivors, these are comprised of a few good people, a gang of vicious thugs (led by Sid Haig, who excels in the role) and some mutants, who eat human flesh.
Aftermath is a very violent movie, it did find itself on Section 3 of the Video Nasties list in Britain, though it was never prosecuted. It is also a very cheap looking movie, add to that a bad script and some very far fetched fight sequences, I did find it quite comical at times. So bad it's good. Well sort of. Certainly recommended for Sid Haig and post apocalyptic movie fans.