Parasite. 1982.
In a post-apocalyptic USA, a scientist is infected with a strange parasite and heads to a small town where it's unleashed.
This one I have only seen snippets off, for a early 80s film this wasn't too bad even for a Charles Band film that was made in 3-D and early screen performance by Demi More. The plot itself is simple, and always have a punk group wannabe that end up being the stupidest people to survive a nuclear war and become victims of a internal parasite breeding ground in their bodies. Entertaining enough to watch.
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