Halloween - released 1978
Halloween II - released 1981
Halloween III - Season of the Witch - 1982
Halloween 4 - The Return of Michael Myers - 1988
Halloween 5 - The Revenge of Michael Myers - 1989
Halloween 6 - The Curse of Michael Myers - 1995
Halloween 7 - Halloween H2O: 20 Years Later - 1998
Halloween 8 - The Resurrection - 2002
Image from IMDB
Here's another saga that I must watch every year or it just doesn't feel like Halloween. Halloween III is seemingly unrelated, but there's this underlying cult plot that didn't crop up until Halloween 4, and I've only seen it once, so I can't say for sure that it doesn't really have any connection. Sure, Michael Myers isn't in it, he's healing from the burns he receives at the end of II, but I thought that maybe, just maybe, it might be a cover for bringing him back from the dead. When I watch again, I'll be sure and update this idea.
There are two more Halloweens, but they are remakes, and not continuations.
Halloween 9 - Halloween I remake by Rob Zombie - 2007
Halloween 10 - Halloween II remake by Rob Zombie - 2009
I haven't seen either of these yet, but topping the original will be hard to do. As much as I like Malcolm MacDowell, I just can't see him as Dr. Loomis. Donald Pleasence has always been Dr. Loomis, and always will be. Plus, Jamie Lee Curtis really was good in this role, and I don't see how she'll ever be outdone.
In fact, Nick Castle, the original "Shape" was the best. He looked creepy, and looked just strong enough, and most of the rest just didn't have it, and that took away from the character of Michael Myers. That was one problem I did have with this series, it didn't keep the same guy for each movie. Seriously, it would have made sense to keep one guy for all of the movies.
Those of us who've watched each movie more than once know that there's four people from Halloween 6 who survived - Kara Strode, Tommy Doyle, Jamie Lloyd's baby Steven (Laurie's granddaughter) and Kara's son, Danny, who was hinted at being similar to Michael when Michael was that age - hearing "the voice". All 4 of these people escaped.
Where did they go? Far away from Haddonfield, IL I'm assuming, but still, where did they go?
We know that Laurie's son John and his girlfriend get killed at the beginning of Halloween: Resurrection, but nothing has ever been mentioned of Tommy, Kara, Danny or Steven. If so, I missed the references the two times I've watched it on TV. However, there is no mention of them in either Halloween 7 or 8, which I find annoying because it's a dangling storyline.
Plus, what actually happens to Michael as a result of not being successful with the ritual killing of the infant? Does he really and truly stay dead? Did he really let these people go because they saved his own child? In any event, isn't that what he did when he killed all of those geneticists? He saved his child from something, but the question is what? Of course, one could also be left wondering if he really saved Steven and Danny or had the procedure already been done?
Without a true continuing movie, we'll never know. There are some comics, but they aren't considered part of the "official" storyline.