William "Stuttering Bill" Denbrough is the brother of George Denbrough and the husband of Audra Phillips. He is the main character and the leader of the Losers' Club in IT. He is an author when he grows up. He is good friends with Mike Hanlon, Eddie Kaspbrak, Richie Tozier, Ben Hanscom, Beverly Marsh and Stan Uris.
GeorgieOne stormy day, Bill's brother George was bugging him while he was sick with the flu. Bill made him a boat from a sheet of newspaper to play with outside, and told him to be careful. While George was playing with his paper boat it was caught in a strong current of rainwater and ended up in the sewer, where Pennywise the clown catches it. He makes idle conversation with George but kills him shortly after, by tearing off his arm. After George dies, Bill's stutter grows worse.
Creating the Dam
While building a dam in the Barrens, Bill and Edward "Eddie" Kaspbrak are confronted by the school bully Henry Bowers and two of his friends, Victor Criss and Belch Huggins, who are in pursuit of Ben Hanscom. Bill and Eddie tell them they haven't seen him, and, believing they're lying, Henry pushes Eddie to the ground, breaking his nose while Henry breaks down their dam (In the movie, Henry does shove Eddie to the ground, but it triggers an asthma attack rather than resulting in a broken nose). Bill tells them to back off and Henry, Belch and Vic leave, losing interest in finding Ben. After his inhaler goes out, Eddie sends Bill to go to Mr. Keene's pharmacy store to get a new one. While waiting for Bill to return, he meets and befriends Ben, who had been hiding from Henry in the Barrens and witnessed Henry break down the dam. Both Ben and Eddie decide to fix up the dam. While fixing it up, Ben and Eddie have a conversation about their deceased fathers, Ben's to the Korean War and Eddie's to cancer. When Bill returns, Eddie introduces him to Ben. The three friends finally fix up the Dam.
The House On Neibolt Street (This is not in the movie)
Feeling guilty for the death of his brother, Bill, armed with his father's Walther PPK .380, travels down to one of the distant houses on Neibolt Street (where Eddie had encountered It in the form of the homeless leper under the house's porch) in pursuit of his brother's killer, whom he believed to have still lived there. Bill's friend, Richie, accompanies him to the house, though reluctantly. While searching around the deserted house, the two are ambushed and attacked by It, with Bill perceiving it as Pennywise the clown, and Richie as the werewolf from "I Was a Teenage Werewolf". The creature chases the boys across Neibolt Street, with Bill managing to partially wound It with his rifle. The two manage to barely escape with Bill's trustworthy bike, Silver.
The Ritual of Chud (I)
Returning to Derry
On May 29, 1985, Bill receives a phone call from his old friend, Mike Hanlon (who was the only loser to stay behind in Derry), telling him that the child killings are happening again. Mike asks him to return to Derry, as he fears that It may still well be alive. Upon learning of It's return, Bill becomes so frightened and worried that he begins to stutter uncontrollably, his childhood reaction to stress and trauma. After a brief dispute with his wife, Audra, Bill eventually departs to Derry to face It once more, as he had twenty-seven years ago.
The Ritual of Chud (II)
The Devil Diminishes (Audra)
When she makes it to Derry, IT uses Tom Rogan to capture her and uses her as bait to lure Bill Denbrough. The Losers defeat IT once and for all, and rescue Audra from IT's lair. She survives (she is the only person to survive the death defying limbo), but is left in a catatonic state. Bill helps Audra to come out of her catatonia by taking her on a bicycle ride on his childhood bike, Silver. He is impersonating the Lone Ranger, which is something he had done years earlier to help revive a young Richie, who was frozen with fear after meeting IT. Slowly she comes out of her catatonia and holds Bill, finally overcoming her fear. They kiss in the middle of a traffic stop in relief of her coming back to reality.