Often cited to be one of the worst films ever made, but I don't really see it. Sure enough, this is a pretty cheesy affair, the kind of film Ishiro Honda would make if he'd had no budget at all, but one thing it is not is boring. And there are many similarly cheap films that can't even claim to be fun.
Aliens are planning to take over planet Earth, and they've come up with a slick plan to do so. Rather than come with an army of their own, they invade the cemeteries and start to bring the dead back to life. With their army of undead humans, they plan to overrun the cities and conquer Earth.
These old B-movies are often extremely dialogue-driven (and terribly boring as a result), as a way to disguise their lack of budget. Wood Jr. doesn't cut back on effect shots (or silliness), instead, he makes do with what he's got. Yes, it's a complete cheese fest, but the pacing is slick and there's enough wackiness to prevent boredom from creeping in. Much better than many give it credit for.