The original plan was that the character of Michael Myers was actually killed off in Halloween 2. He was supposedly dead, end of the Michael Myers stories, but the franchise had intended to keep on going with different stories set around Halloween time. The franchise did this in Halloween 3. It was a completely seperate story from the first two Michael Myers ones. The 4th installment would have been completed unrelated to parts 1,2 and 3 if the general public hadn't reacted pretty much how you are right now. People went to Halloween 3 expecting to see Michael Myers. They didn't see him. They didn't like it. So the studio brought him back for the 4th (and subsequent) sequels.
Halloween 3 would have a MUCH better reputation if it had just been released under the title 'Season of the Witch' and not associated with the Halloween franchise at all, but how could the studios have known there would be such a public outcry to bring back Michael Myers?
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