Glen is now about six years old, and is having nightmares about murdering people. He's been living as a sideshow act with a cruel ventriloquist, until he sees his parents on t.v., but doesn't realize they're just puppets.
Hollywood's making a movie based on Chucky's exploits, and Glen realizes who his parents are, and escapes from the sideshow and heads for Hollywood. He's been carrying the Heart of Dembala since he was born, which he unintentionally uses to bring Chucky and Tiffany back to life.
So the family is united, just in time for Chucky and Tiffany to murder their first victim, which shocks Glen, who is a pacifist. And androgynous, which is discovered when the parents can't tell wether he's a boy or a girl.
So they hitch a ride to Jennifer Tilly's house and hatch a plan: They'll get Jennifer Tilly pregnant so Glen will have a human body, then Tiffany will take Jennifer Tilly's body, and Chucky will take over Redman.
More murders happen, including a reporter, the director Jennifer hopes to sleep with to win a role, Jennifer's assistant and limo driver, and a few various others. Jennifer's been impregnated through voodoo, which only takes three days to go through, and delivers twins, and since Glen has a split personality (Gentle Glen and Psychotic Glenda), he doesn't have to decide what sex he wants to be now.
But Chucky realizes that life as a doll is infinately better, and decides to stay in his current body, but Tiffany wants to be human, and causes Chucky to try to kill her when she says she's leaving, and taking Glen with her.
Chucky goes to kill Tiffany as she's about to transfer her soul (in the best Shining parody EVER) and apparently kills her, setting Glen off. Glen and Chucky get into it, and in an odd sequence, Glen kills Chucky via martial arts and an axe.
Five years later, we discover Tiffany actually succeeded. She's taken over Jennifer Tilly's body, and Glen/Glenda now reside in the twins. Glen's an angel
, and Glenda's a psycho. Both have Chucky's hair.
At their birthday party, Glen receives a package, and discovers Chucky's disembodied arm, which attacks him, ending the movie.