Often celebrated as the worst science fiction film ever, this film which inspired the Tim Burton biopic about the director, Ed Wood, has undeniable cult status.
Wood was famous for using two minutes of film featuring a silent Bela Lugosi as Ghoul Man, then replacing Lugosi with his wife's homeopathic healer.
As he looked nothing like Lugosi the replacement Ghoul Man had to carry a cloak in front of him at all times, this alone makes it is easy to see how the film gained its reputation!
The plot, such as it is, is based on the attempt by aliens to conquer Earth using human zombies as their foot soldiers. So bad it's funny.