IMHO, Michael Myers and Leatherface have no business in this teamup franchise. These two have entirely different feels to them than Jason and Freddy do, and they quite simply don't fit.

While there may indeed be supernatural forces at work with them, Michael and Leatherface are nothing more than guys who are tough to kill. They're not zombies or demons. Michael Myers, in fact, always has a rational (if often far-fetched) reason for surviving his previous movies. I'll paint the picture for you, with the warning that there are SPOILERS AHEAD.

Halloween: Loomis shoots Michael several times with a .32 caliber revolver. Michael falls out the window, about 15 feet, then vanishes. We see Michael jerk from the gunshots a few times, but it's never firmly established how many shots actually found their mark.

Halloween 2: Takes place in a hospital. Theorize that Michael made his way there after the events of Halloween 1 and was treated for his injury. If he removed his mask, he could easily have passed as a prankster kid and gone on without much suspicion (at least at first). It's more than possible to survive gunshots from a .32 caliber revolver and walk away. Had Loomis had a larger caliber gun, this would be even more difficult to believe, but with a .32 it's feasible, if unlikely. And a guy of his size wouldn't have much trouble sucking up a 15-foot fall. I've done it and I'm 5'6" tall, overweight, and out of shape.

Halloween 4: Michael has been in a coma for years after being severely burned at the end of Halloween 2. He wakes up. In reality his muscles would've atrophied in all likelihood, but it's a movie, so we roll with it.

Halloween 5: Michael escapes the throwing of dynamite into the well by washing out into a drainage culvert. Looking closely we can see that the gunshot wounds he suffered were all in nonlethal areas like his shoulder and leg. He is nursed back to health (in Frankenstein fashion) by a blind old man (who he later kills).

Halloween 6: At the end of Halloween 5, Michael is broken out of jail by the cult in this film. I tend to be in denial over this film, because the whole genetic engineering angle was just, well...stupid, and it really screwed what could've been a neat concept of the man in black. Jamie Connors also deserved a better exit than the one she got. She could've taken up the torch for Laurie Strode later on, in fact. Ah, well. At least they made the effort to stick with the family connection. Better than Resurrection did. Anyway, Michael's death at the end of this movie is never firmly established--he's just drugged and beaten; however....

Halloween H20: We do find out that Loomis died. There are few details, but presumably Michael won that final confrontation or at very least was gone when Loomis went back for him.

Halloween: Resurrection....this one never happened. I'm in complete denial because basically, it sucked and trashed the entire concept of Michael Myers. However, if you must...it's established that during the few minutes he was off camera in H20, Michael switched clothing with a paramedic and escaped. It was not in fact him that Laurie Strode beheaded.
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Jason Vey
The Grey Elf
http://www.grey-elf.com/
Visit my online store at http://www.cafepress.com/bigheaddesign
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If everyone knows the supernatural is real, than any psycho with a grudge can summon up Azathoth and destroy Oklahoma.--Nyarlathotep, BtVS RPG posting forum