This one ignores all the other sequels. The franchise's continuity is a bit of a clusterfuck with different sequels ignoring other ones, but here's the different continuities.
Original Continuity:
- Halloween (1978)
- Halloween II (1981)
- Halloween 4: The Return of Michael Meyers (1988)
- Halloween 5: The Revenge of Michael Meyers (1989)
- Halloween: The Curse of Michael Meyers (1995)
First Alternate Continuity
- Halloween (1978)
- Halloween II (1981)
- Halloween H20: 20 Years Later (1998)
- Halloween: Resurrection (2002)
Second Alternate Continuity
- Halloween (1978)
- Halloween (2018)
Rob Zombie Remake Continuity
- Halloween (2007)
- Halloween II (2009)
Completely Unrelated Standalone Film about Warlocks and Robots from Back When John Carpenter Wanted to Kill Off Michael Meyers and Make the Franchise a Series of Completely Unrelated Standalone Films by Different Filmmakers That All Took Place on Halloween
- Halloween III: Season of the Witch (1982)