Shot in nine days.
Paul Blaisdell created and portrayed the monster . It was made from foam rubber, claws from a magic shop and toenails carved from white pine. Due to Blaisdell's height, he had limited visibility while in the costume. This caused problems when he had to carry Lori Nelson, and almost caused Blaisdell to drown when the costume began to fill with water during filming.
Louise (Lori Nelson) keeps a picture of her now-dead boyfriend by her bed. The picture is that of director Roger Corman.
The fourth film directed by Roger Corman, and his first in the science-fiction/horror genre. It was shot over ten days with a budget of $96,234.49.