Halloween H20 is a weird beast of a movie in regards to series continuity. It was meant to make Halloween a trilogy even though it was the 7th movie in the series. Infamously, Halloween 3 has nothing to do with Michael Myers but the 4th through 6th movies were all about him. Halloween H20 takes the fourth through sixth movies out of cannon and picks up 20 years after the end of Halloween 2...got it?
Jamie Lee Curtis returns to her breakout role of Laurie Strode but this time, she has changed her identity and moved across the country to escape her crazy-ass brother. She is raising Josh Hartnett and dating Adam Arkin. There isn't much innovative or interesting about this movie besides the attempt to capture some of that Scream magic that was all the rage in the late 1990s. LL Cool J guest stars as a campus security guard who gets involved in the hunt for Myers once Myers tracks his sister down. I will say the one image that stayed with me from this movie was the final confrontation between Laurie and Michael. It was an attempt to definitively end the series that still didn't work (see Halloween Resurrection, or better yet, don't).