It: Welcome to Derry is an American supernatural horror television series based on Stephen King's 1986 novel It. Serving as a prequel to the films It (2017) and It Chapter Two (2019), the series was developed by Andy Muschietti, Barbara Muschietti and Jason Fuchs, all of whom were involved in the It films. The series stars a large ensemble cast including Bill Skarsgård, who serves as executive producer and reprises his role as Pennywise from the films.