Writer / producer / director Jimmy Sangster was brought in to look at and revise, if necessary, the original screenplay by Jeremy Burnham, and realized that it was essentially Frankenstein s'est échappé (1957) all over again, which had been done just a dozen years earlier. Not wanting to do the same movie again, it was his decision to inject all the humor and sex into the script. He didn't commit fully to the project until Hammer Studios agreed to give him the opportunity to direct.
The first Hammer production to be entirely financed with British funds.
This Frankenstein film stands alone and is not a part of Hammer's six film Frankenstein series, starring Peter Cushing as Dr. Frankenstein. It was, essentially a remake of Frankenstein s'est échappé (1957), and it is rumored that a younger actor, Ralph Bates, was cast to appeal to a younger audience.