Ah, Ed Wood. There was something wrong with that guy.
A guy named Criswell wants to tell us about the future, and it has something to do with what happened in the past. See, an old man is in mourning over the death of his wife, so he wanders out into traffic and is killed. Then, both he and his wife return from their graves to kill two grave diggers and a really big police inspector. Then, a commercial airline pilot sees a UFO. Then, a whole bunch of people see UFOs over Hollywood. The army uses stock footage to shoot at the UFOs, but it doesn't do any good, so the Pentagon sends an officer to Hollywood to check on the UFO sightings. As it turns out, the aliens are raising the dead to send a message that the government can't ignore. They want mankind to stop the arms race before they make a bomb that explodes sunlight particles, because that would destroy the universe, but the government isn't listening, so the aliens decide to make their presence known in the best way possible: by raising an army of the dead. Okay, by raising three corpses and then melting one of them in front of witnesses. Then, they decide to kill those witnesses, because they don't want anyone to learn of their existence. That doesn't really work out, either.
"You see? You see? Your stupid minds! Stupid! Stupid!"
This thing is a hoot. Sure, there's not much talent or skill involved in the production, but there's more than enough entertainment to be had from the bad dialog, the bad special effects, the bad acting, and the unbelievably silly story. When an airplane cockpit is represented by two guys sitting in front of a fake wall, you know you've got a heck of a ride ahead of you.
"One thing's sure. Inspector Clay's dead, murdered, and somebody's responsible."