"Anytime there's a popular horror movie, it's bound to get a sequel - or two, or three, or nine. With so many franchise installments, many of them produced on the cheap, horror movies aren't exactly known for their rigid continuity. In fact, later movies in a series will often outright contradict earlier ones, while some installments specifically ignoring their predecessors altogether."
"As a result, keeping track of just what the heck is going on in your favorite horror franchise can be - frankly put - murder, especially in the age of remakes, reboots, and late-era sequels. Fortunately, we've pulled apart the timelines of some of the most confounding franchises to help walk you through which movies "count" in continuity, which don't, and in what order you need to watch them in to get the whole story - or all the different stories, as the case may be."-Ranker