Originally called Grave Robbers from Outer Space, Plan 9 from Outer Space was renamed because of its "sacrilegious" title, which did little to save it from being regarded by many as the worst movie ever made, and earning it and its director Ed Wood a Golden Turkey Award.
The plot involves aliens who come to Earth to stop humans who have developed the ultimate weapon — one that can explode the "particles" of sunlight — and the aliens try to conquer Earth by resurrecting corpses from a cemetery. Actors screw up their lines, night turns to day and back in a single scene, and the movie's top billing goes to an actor who died early in the filming (Bela Lugosi) and appears only in a couple of scenes at the beginning. Later in the film, Lugosi's character is doubled by a taller, younger, blonde-haired man (some say Wood's chiropractor) holding a cape over his face. The special effects consist of pie tins substituting for UFO's and multitudinous stock footage.
The movie has a "campish" or cult film popularity among those who appreciate hilariously bad motion pictures. Such appeal is heightened by quotable lines such as, "Inspector Clay is dead. Murdered. And somebody's responsible!"