The Halloween franchise has gone through different retcons that have created different timelines, and while not all have been successful, Halloween Kills ended up hurting the franchise more than any other movie. John Carpenter introduced the world to serial killer Michael Myers in his 1978 movie Halloween, and while building a movie saga wasn’t among his plans for it, the Halloween franchise has become one of the most beloved ones in the horror genre, even though it has been quite inconsistent and not all of its movies have been beneficial to the stories of Michael Myers and Laurie Strode (Jamie Lee Curtis).

https://screenrant.com/halloween-kills-movie-franchise-hurt-most/