HBOβs It: Welcome to Derry goes deep into the lore of Stephen King, exploring the cursed Maine town decades before the events of It and It: Chapter 2 along with other characters and imagery from across his many works. The show’s primary source material are a series of interludes in King’s original book, which take the form of fragments of Mike Hanlon’s research into Pennywise’s appearances throughout Derry history. However, one of the Welcome to Derry‘s most interesting plotlines doesn’t come from the book at all.

