Stephen King's It is a complex story in which a lot of things happen, and at times things get a bit confusing. But don't worry about getting lost in the story — we're here to explain everything you need to understand the full story of the movies made from the classic novel. Possible spoilers ahead.
2017's It didn't get into the backstory of its ancient antagonist outside of implying that it's been around for a long time, but thankfully, King's original novel goes into much more detail. It, the shapeshifting being that often manifests itself as a creepy clown named Pennywise, has actually been around longer than mankind itself — It's an ancient cosmic being that's billions of years old that originated in another dimension outside of our universe known as the Macroverse.
In prehistoric times, It came to Earth on an asteroid, landing in the place that would millions of years later become Derry, Maine. It hibernated until humans appeared, and then began a cycle of awakening roughly every 27 years to feed on them. It can take on any form, but its favorite eventually became that of Pennywise the clown. Its true form, known as the Deadlights, is apparently so trippy it'll drive you crazy. Beverly Marsh managed to glimpse them in the first film and make it out with her sanity, though doing so did render her comatose for a time.
As strange as Pennywise is, its mortal enemy is even more bizarre: A giant turtle named Maturin who hails from the same place as Pennywise. Keep watching the video because we finally understand the entire It story!
In the beginning | 0:16 You'll float, too | 1:51 Meet the Losers | 2:59 A love triangle | 4:03 A bad place to grow up | 5:18 Pennywise the Dancing Clown | 6:32 Sewer rescue | 8:03 A blood oath | 8:30 27 years later | 9:26 Henry is back | 10:08 The final battle | 10:45