"Alien Trespass" is a sincere attempt to make a film that looks like one of those 1950s B movies where a monster from outer space terrorizes a town, which was almost always in the desert. A town, to save on extras and travel. In the desert, because if you headed east from Hollywood, that's where you were, and if you headed west, you were making a pirate picture. "Alien Trespass" is in color, which in the 1950s was uncommon, but otherwise, it's a knowing replication of the look and feel of those pictures, about things with jaws, tentacles, claws, weapons that shot sparks, and eyes that shot laser beams at people, only they weren't known as laser beams but as Deadly Rays.