Evils of the Night US

Alien vampires aren’t the only things that suck in this movie; this whole movie sucks. But thenkfully, the poster is top-notch exploitative majesty, from the creepy undead aliens getting a transfusion to the scantily-clad buxom blonde with protruding nipples being pawed decaying zombie hands. Why is it that so often the quality of movie poster art is inversely related to the quality of the film itself?