This movie unquestionably falls into the category of being bad—and more than just bad, it’s a fascinating example for anyone learning about filmmaking because nearly everything that could have gone wrong, did. The issues start with Ed Wood's remarkably poor direction. I honestly think my cat could direct better. He seems inattentive, careless, and unable to guide the process effectively, essentially letting everyone else do their jobs as they see fit. There’s no concern for continuity; days and nights appear randomly, props show up and vanish repeatedly. We can plainly see the filming equipment—cameras, microphones, lights—and even witness the cardboard headstones in the cemetery tipping over, so obviously fake that it's hard to believe they were used at all. And I’d rather not even discuss the flying saucers, which are clearly children’s toys suspended by visible strings, likely controlled with fishing rods! The script is another significant problem, presenting one of the most outlandish and patently false stories science fiction has ever produced. It awkwardly combines vampires, zombies, and aliens, leaving you wondering if they might just find Tarzan, Donald Duck, a couple of cowboys, and a vacationing family from Minnesota having a barbecue in the cemetery. The creativity is boundless! And the dialogue? The film provides an endless supply of unintentional humor and memorable lines because of how childishly and absurdly everything was written. The cast includes several familiar names, not because they are talented actors, but because they've had important roles at various points in their careers. Maila Nurmi, known as Vampira, is among them; she doesn’t speak a word and mostly just stares at the audience and the other characters. Even without saying anything, this is certainly one of her most recognizable performances, showcasing a truly remarkable character portrayal. Tor Johnson also appears, with his distinctive look that made him memorable in low-budget horror films of the time. Bela Lugosi had his final film role here. Always draped in the aristocratic vampire cape that defined him—the very same he would later be buried in—he died during filming and was cleverly replaced by another actor who concealed his face under the cape to disguise the difference.

Source on TMDB