Plot

During a heavy rainstorm in Derry, Maine, in the spring of 1960, George Denbrough plays in the streets with a paper sailboat made by his stuttering older brother, Bill. It goes down a storm drain, where Georgie encounters Pennywise the Dancing Clown. Pennywise entices Georgie to reach in to retrieve his boat, only to tear his arm off and leave him to bleed to death. A few months later, Bill and asthmatic Eddie Kaspbrak befriend the chubby new kid Ben Hanscom. They are later joined by Beverly Marsh, who lives with her abusive father, and she and Ben are introduced to Bill and Eddie’s other friends: the comical Richie Tozier and skeptical, Jewish Boy Scout Stan Uris.

Ben develops feelings for Beverly, and sends her an anonymous poem, but she assumes the poem is from Bill and develops feelings for him. At school, by the creek, and around town, they are all bullied by Henry Bowers and his greaser gang. The children all have grotesque, frightening encounters with Pennywise. In July, the group is joined by Mike Hanlon, an African-American boy, as Bowers’ gang chases him. The children, now dubbing themselves the “Losers Club”, fend off the Bowers Gang with rocks. While looking through Mike’s History of Derry school project scrapbook, the Losers realize that Pennywise, whom they refer to as “It”, is not a human being but an ancient creature that awakens roughly every thirty years to hunt and feed.

Realizing that It killed Georgie, Bill leads the Losers into Derry’s sewers to kill the creature. Stan becomes separated from the group and is ambushed by Bowers and Belch Huggins. Belch is killed by It who has also already killed Victor Criss (who had separated from the group to set up an ambush), and Henry is left traumatized, his hair shocked white. Stan regroups with the Losers in a large sewer drainage chamber. The chamber fills with fog as the seven join hands to form a circle, their united strength, but the circle is broken when Stan is grabbed by It. The Losers take advantage of It’s ability to access and use their imaginations against It. Eddie imagines his inhaler is full of battery acid, injuring half of the clown’s face, then Beverly slingshots silver earrings at It, which seems to ‘break’ Pennywise’s head open, his light force seeping out. Wounded, It flees down a drain, where the kids hear moaning, and conclude It is dead. The group exits the sewers, but vows to return should It ever return. Bowers, now insane or possessed from It’s deadlights, confesses to the child killings and is institutionalized.

Thirty years later, in May 1990, It kills Laurie Ann Winterbarger in her backyard, signaling another awakening and feeding spree. Mike, the only one to stay in Derry, contacts his old friends to fulfill their oath after hearing reports of missing children. All of the Losers, who have gone on to have successful careers, return, except Stan, who cannot bear the thought of returning to Derry to fight It, and commits suicide. The other Losers reunite in Derry, later learning of Stan’s suicide. Upon returning, they are all taunted and terrorized by Pennywise. Bowers, with It’s help, escapes from the asylum to murder the Losers. Bill’s wife, Audra, travels to Derry but is captured by It, hypnotized by the monster’s “deadlights”. Bowers attacks and stabs Mike, but fatally stabs himself with his knife when Eddie and Ben rush in to save Mike. Mike is hospitalized, and he gives Bill the two silver earrings he retrieved from the sewers ten years ago. The five remaining Losers return to the sewers to confront It, where Bill realizes that It has Audra.

They reach It’s inner sanctum, see the catatonic Audra engulfed in spiderwebs, and discover It’s true form of a gigantic, otherworldly spider. Bill, Ben, and Richie are entranced by the deadlights emanating from It’s underside, while Beverly retrieves the silver earring she overshot. Eddie attempts to repeat the wound he inflicted on It as a child, but is grabbed and mortally wounded. Beverly frees her friends, but Eddie dies. The others follow the injured demon spider, finishing it by ripping out its heart and crushing the heart. They remove Eddie’s body and the catatonic Audra from the sewers. Mike recovers in the hospital, explaining how the Losers go their separate ways once again, their memories of It and each other fading over time, save for his journal; Beverly and Ben get married and are expecting their first child, and Richie is cast in a film. Bill is preparing to leave Derry, but pulls Audra out of her catatonia by riding her down a street on “Silver”, his childhood Schwinn cruiser.