Edited footage from La Momia Azteca (1957) and La Casa Del Terror (1960)
The laboratory scene features electronic sound effects lifted from Forbidden Planet (1956).
It's been said that Edward D. Wood Jr. filmed a few scenes of Lon Chaney Jr. in a werewolf costume in Hollywood in 1964, which Jerry Warren incorporated, Chaney biographer Don G. Smith however has stated that this story was never substantiated.