When I was a kid, we had no home video: No Betamax, no VHS, no Laserdiscs, no DVD, no Blu ray, etc. The only way most of us could watch a movie in our homes was to buy 8mm movies like those offered by a company called Castle Films. They weren't cheap if you were a kid. They also weren't very long. Castle Films took many of the great Universal monster movies and released them as one-reel movies of approximately 10-15 minutes. They even cut some of them down to four minutes!
The first time I saw the 1943 classic Frankenstein Meets the Wolfman, it was a Castle Film that a friend of mine had purchased. Castle took the movie — which was an hour and fourteen minutes in its original release — and hacked it down to a little over four minutes. Later, I got to see it in full and I realized that with the Castle Films version, I really wasn't missing much, plus I saved seventy minutes!