- Bill Denbrough (Jaeden Lieberher (first film)/James McAvoy (second film)) (the leader)
- Beverly Marsh (Sophia Lillis (first film)/Jessica Chastain (second film)) (the only girl in the group)
- Ben Hanscom (Jeremy Ray Taylor (first film)/Jay Ryan (second film)) (an expert on Derry's history)
- Richie Tozier (Finn Wolfhard (first film)/Bill Hader (second film)) (Bill's best friend, and the loudmouth of the group)
- Eddie Kaspbrak (Jack Dylan Grazer (first film)/James Ransome (second film) (a germophobe)
- Stan Uris (Wyatt Oleff (first film)/Andy Bean (second film) (a timid member of the group)
- Mike Hanlon (Chosen Jacobs (first film)/Isaiah Mustafa (second film)) (a homeschooled African-American)
Throughout the summer, each of the kids encounter terrifying sights, including Mike's parents burning alive, a fountain of blood, a headless boy, a rotting man, a shade of Georgie, and a disfigured woman in a painting.
They eventually discover that they are being terrorized by the same creature. Going to the Well House at 29 Neibolt Street, they are confronted by Pennywise, but manage to repel him. Afterwards, Eddie, Richie, Stan, Ben, and Mike defect, while Bill and Beverly are the only ones still willing to fight.
When Beverly is kidnapped by Pennywise in August, the others reassemble to save her. Through courage and teamwork, they manage to defeat Pennywise, sending him into early hibernation. At the end of summer, the kids make a vow that if Pennywise comes back in twenty-seven years, they will return to Derry to destroy him for good.
After the events of the summer of 1989, the kids have grown up and moved to different cities: Bill has become a writer, Beverly has become a fashion designer in Chicago, Richie has become a DJ in Los Angeles, Ben is an architect in Nebraska, Stan has become a partner for an Atlanta-based accounting firm, Eddie starts a limousine business in New York, and Mike has become the town librarian in Derry.
In 2016, a young gay male, Adrian Mellon, is thrown off a bridge by a group of teenagers and killed by Pennywise. Mike immediately informs Bill and the others about Pennywise's return. However, Stan, rather than come back to help them deal with the clown again, kills himself, leaving only Bill, Beverly, Eddie, Richie, Ben, and Mike to deal with It.
It (2017 film)
It: Chapter Two