Domande frequenti

Planet of the Vampires is based on the short story, 'Un nolte de 21 orc' ('One Night of 21 Hours'), by Italian scifi writer Renato Pestriniero. Originally shot as an Italian-Spanish film titled Terrore nello spazio, the script was written by Italian director Mario Bava along with Italian screenwriters Alberto Bevilacqua and Callisto Cosulich and Spanish screenwriters Antonio Roman and Rafael J. Salvia. The English-language version was written by American screenwriters Ib Melchior and Louis M. Heyward.

It's been reported that each of the actors said their lines in their native tongue. Thus, Captain Markay (Sullivan) is speaking English, Wes (Ángel Aranda) is speaking Spanish, Sanya (Norma Bengell) is speaking Portuguese, and Tiona (Evi Marandi) is speaking Italian. As was typical for Italian films in this era, dubbing was later done post-production for the respective markets.

Mark and Sanya successfully retrieve the meteor rejector from the Galliott and return it to the Argos where Wess is waiting to take off. Once in the air, Mark tells Wess to get some sleep, since he hasn't slept in two nights. As Wess is falling asleep, he notices Mark standing outside his door and holding his field ray gun. Wess reports Mark's strange behavior to Sanya who reveals that both she and Mark are controlled by aliens. Mark gives Wess a chance to join them, but he refuses and destroys the meteor rejector, electrocuting himself in the process. Mark and Sanya realize that they will never be able to reach home without the meteor rejector, so Mark decides to land on the closest planet -- a small, primitive planet called Earth. 'How will they accept us?' Sanya wonders. 'I hope well,' Mark replies, '...for them.'