Scream 3

Cotton Weary, now a successful talk show host, is contacted by Ghostface, who demands to know the whereabouts of Sidney Prescott. When Cotton refuses to cooperate, Ghostface murders him and his girlfriend Christine. Detective Mark Kincaid contacts Gale Weathers to discuss Cotton's murder, prompting her to travel to Hollywood. She finds Dewey Riley working as an adviser on the set of Stab 3: Return to Woodsboro, the third film in the series based on the Ghostface murders where he is now dating Jennifer Jolie who plays Gale in Stab 3.
Ghostface kills Stab 3 actress Sarah Darling, halting the film's production to the frustration of director Roman Bridger. The remaining cast, along with Dewey and Gale, gather at Jennifer's home, where Ghostface stabs Jennifer's bodyguard to death and causes a gas explosion, killing co-star Tom Prinze, who plays Dewey.
Elsewhere, Sidney is living in seclusion under an alias, fearing another killer may strike, and works as a crisis counselor for an abused women's hotline. Having uncovered her location, the killer begins taunting Sidney using a voice changer to sound like her deceased mother Maureen Prescott. Sidney travels to Hollywood, realizing she is no longer safe. Gale and Jennifer learn that Maureen briefly worked as an actress in the 1970s under the stage name "Rina Reynolds" and had been raped at a party held by Stab 3 producer John Milton.
Martha Meeks, the sister of Sidney's murdered friend Randy, visits Sidney and the others to deliver a videotape that Randy made before his death. Randy posthumously warns them the rules of a horror film do not apply in the third film of a trilogy and that any of them could die. Sidney is later attacked by Ghostface on the Stab 3 set, forcing the police to hold her for protection.
Dewey, Gale, Jennifer, and the remaining cast, Angelina Tyler, who plays Sidney Prescott, and Tyson Fox who plays Rickey, attend a birthday party for Roman at Milton's mansion. While exploring the house, Gale and Jennifer find Roman apparently dead. Ghostface then attacks the group, killing Angelina, Tyson, and Jennifer while taking Gale and Dewey hostage. Ghostface contacts Sidney, and she travels to the mansion. Kincaid follows but is knocked unconscious by Ghostface. Sidney is lured to a secret screening room where Ghostface appears and reveals himself to be Roman, having faked his death.
Roman explains that he is Sidney's half-brother and the product of Maureen's sexual assault. Four years prior, he tracked Maureen down, only for her to reject him. Roman began stalking her and filming the men she philandered with. He showed Billy Loomis footage of his father with Maureen, setting off the string of murders in Woodsboro. When he discovered the fame Sidney attracted due to those events, Roman snapped and lured her out of hiding, planning to kill her and frame her for his murders. After Roman reveals a bound Milton and slits his throat, Sidney furiously denounces his explanation as nothing more than deflection to hide his selfish motivations. Roman suffers a mental breakdown and attacks, and after a ferocious fight, Sidney ultimately outsmarts Roman and repeatedly stabs him. As Dewey and Gale arrive, Roman rises and tries to attack them once more but is finally killed when Dewey shoots him in the head.
Later at Sidney's house, Dewey proposes to Gale, who accepts. Sidney returns from a walk and leaves her previously alarmed front gates open. As she joins Gale, Dewey and Kincaid to watch a movie, a wind blows her front door open, but she ignores it.