The Brain Eaters (1958) review

One day, a rocket-shaped object is found on American soil, leading investigators to try to figure out where it came from; elsewhere, some people - including the mayor - are going mad due to cranium-piercing parasites that are on the loose.  Unlike many B-pictures, it's not totally incompetent - and it has a trim one hour running time - but that's not saying a whole lot: the effects are pitifully chintzy and virtually every component of it - from direction to acting - is underwhelming.  Back in the day, sci-fi writer Robert A. Heinlein sued, claiming (correctly) that this was plagiarized from his novel The Puppet Masters and that he found the movie to be "wanting" ... which, for a diss, was fairly polite.