IT:

When children begin to disappear in the town of Derry, Maine, a group of young kids are faced with their biggest fears when they square off against an evil clown named Pennywise, whose history of murder and violence dates back for centuries.

IT: Chapter Two:

Because every 27 years evil revisits the town of Derry, Maine, “IT Chapter Two” brings the characters—who’ve long since gone their separate ways—back together as adults, nearly three decades after the events of the first film.