Plot
Six years after the previous film, the benevolent and genderfluid living-doll child of Chucky and Tiffany is being held captive by "Psychs", an abusive British ventriloquist.
Psychs has mockingly named the doll "Shitface" and regularly mistreats and exploits them. Despite their peaceful nature, Shitface has violent nightmares about murder.
Shitface sees a preview on television for Jennifer Tilly's new film Chucky Goes Psycho which features Chucky and Tiffany dolls repaired from their original remains. Realizing they are their child, Shitface escapes Psychs and tracks the Chucky and Tiffany dolls to a prop room in Hollywood. Shitface uses the Heart of Damballa, a voodoo amulet, to resurrect them. Chucky is shocked at having a child while Tiffany is overjoyed.
Confused about their child's ambiguous gender (them having no genitals) Chucky renames Shitface "Glen", while Tiffany renames them "Glenda". Chucky and Tiffany decapitate a special effects technician with a wire. Jennifer finds the beheaded body and calls the police. Chucky, Tiffany, and Glen/Glenda sneak a ride to her home in her limousine.
Having witnessed their parents murder the technician, Glen/Glenda asks them why they kill. Chucky and Tiffany are taken aback by the question. Tiffany, feeling parental responsibility, tries to force Chucky to stop killing for the sake of their child; Chucky falsely promises to do so. Meanwhile, Jennifer tries to get a role as the Virgin Mary in rapper Redman's feature-film directorial debut. She invites him to her home, intending to seduce him for the role, much to the disgust of her assistant Joan.
Chucky and Tiffany make plans to transfer their souls into Redman and Jennifer. Tiffany knocks them out and uses a turkey baster to inseminate Jennifer with Chucky's semen, intending to use her baby as a host for Glen/Glenda's soul. Chucky takes Glen/Glenda on a secret joyride to kill Pete Peters, a paparazzo who had been following Jennifer around. Glen/Glenda accidentally causes Peters to fall and be soaked in sulfuric acid, killing him. Glen/Glenda is horrified while Chucky is delighted.
Jennifer awakens and senses that she is pregnant, believing Redman is responsible. She confronts Redman who explains this is impossible, as he previously had a vasectomy. He fires Jennifer from his film, dismissing pregnant women as not attractive enough for his vision.
Tiffany guts Redman in anger over his misogyny, which Glen/Glenda witnesses.
The next day, Jennifer wakes up to find herself with a full pregnant stomach, a consequence of the voodoo magic. Chucky captures Jennifer and her lovelorn chauffeur Stan to take Redman's place. Jennifer's assistant Joan tries to help but she is killed by Glen/Glenda, revealing that Glen and Glenda are two separate souls in the same body; Glen is a pacifist, while Glenda is a psychopath.
Jennifer birthes twins, a boy and a girl, and Tiffany realizes that both Glen and Glenda can inhabit the two children. However, the chaos causes Chucky to have an epiphany: he has finally accepted his life as a living doll and no longer wishes to become human. Disgusted, Tiffany rejects Chucky and decides to leave him. Enraged, Chucky throws a knife at Jennifer to stop Tiffany from leaving him but Stan jumps in the way, sacrificing himself to save her. The police arrive, forcing three dolls to flee.
Jennifer is rushed to the hospital. Tiffany drugs Jennifer and begins to possess her but Chucky breaks in and kills Tiffany with an axe. Devastated, Glen/Glenda snaps and attacks Chucky, striking him with the axe. Chucky assumes it's Glenda, but Glen reveals it is actually him and not his murderous twin. Glen dismembers Chucky, who praises Glen for his actions before being decapitated. Realizing what he has done, Glen breaks down in tears as Jennifer comforts him.
Five years later, Jennifer is raising Glen and Glenda, having transferred their souls into the bodies of her two children. During a birthday party for the twins, a nanny quits because Glenda scares her. Jennifer beats her to death in a rage, revealing that Tiffany had successfully transferred her soul into Jennifer's body. Meanwhile, Glen opens a birthday present to find Chucky's severed arm, which springs up and grabs him.
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