The alien costume featured here was the same as the one used in another
Roger Corman film,
Adolescente delle caverne (1958). This was done to save money, as Corman and his brother
Gene Corman often tried to incorporate existing sets, costumes and other elements from previous films into new ones for financial savings. Screenwriter
Martin Varno said the Corman brothers were so conscious of their spending that "'cheap' was the main word in their vocabulary." The monster costume scenes in "Teenage Caveman" and this film were shot within about two weeks of each other. The costume was modified slightly for this film.
Ross Sturlin wore the costume for the scenes in both "Teenage Caveman" and this film. Flming was very difficult for Sturlin because it got extremely hot inside the costume during the exterior shots. John
John M. Nickolaus Jr. was director of photography for the film, and
Jack Bohrer was the production manager.
Daniel Haller, who went on to become a film director himself, worked as art director on this film. He did much of the manual construction work on the set himself, and brought a trailer in to the sound stage so he could sleep there and between work sessions. Among the props he built was the rocket-ship, the frame, which was made of plywood that had been cut into circles, then covered with a plastic sheet and spray-painted to look metallic. Haller also created blood cells that the characters looked at under a microscope, and the baby aliens (which resembled seahorses) they looked at under a fluoroscope.
Alexander Laszlo composed the music for the film. Almost the entire crew went on to work on
L'attacco delle sanguisughe giganti (1959) with the Corman brothers and Kowalski.
