Premise: Chucky is a Good Guys doll who's not very good, and for good reason: he's possessed by the soul of a serial killer. Determined to get out of his plastic body, Chucky seeks a suitable person to receive his transferred soul and a suitable time in which to perform the necessary voodoo ceremony, but neither is very easy -- especially when you're two feet tall.
Potential spoilers ahead!
When serial killer Charles Lee Ray is cornered and mortally wounded in a toy store, he decides to use voodoo to transfer his soul into a Good Guys doll. The doll is bought by Karen Barclay for her son Andy's sixth birthday, and "Chucky" doesn't waste time picking up where his killing spree left off. He bumps off Andy's babysitter, and when Andy tells his mother that Chucky's the culprit, neither she nor investigating officer Mike Norris believe him -- until they're attacked by the pint-sized plastic killer. Chucky meanwhile learns that if he doesn't transfer his soul into the person he first revealed his true identity to (Andy), he'll remain a doll forever. He goes after Andy and his mom but ends up burned, decapitated and shot to death.
Two years after the first film, Andy's mom is in the nut house for reporting a killer doll, while Andy is living with foster parents. The toy company that makes Good Guys rebuilds the doll to combat rumors of it malfunctioning. Chucky, of course, escapes and tracks down Andy, switching places with another Good Guys doll in the house. When Andy realizes that Chucky's back, he tries to convince his foster parents and his teacher, but none of them believe him until they have fatal run-ins with the doll. Chucky performs the voodoo spell on Andy to transfer his soul but realizes that he's been in the doll's body too long and is now stuck. Understandably, he's miffed. He tries to kill Andy in the Good Guys factory but ends up being blown to bits.
Eight years later, Andy is 16 and still in foster care. The toy company shut down production years ago due to Andy's claims of doll possession, but now they figure that enough time has passed that they can resell the Good Guys. At the doll factory, though, blood from Chucky's carcass drips into wax that's used to create a new doll. Newly refurbished, Chucky somehow mails himself to Andy at the military academy he's attending. However, a younger cadet, Tyler, intercepts the package and is overjoyed to have a Good Guy of his own. Chucky decides to target him for transferring souls instead of Andy. Andy finds out, however, and manages to stop Chucky's evil scheme by knocking him into an industrial fan that chops him into pieces.
Chucky's homicidal girlfriend Tiffany steals his remains from the police and raises him with voodoo so that she can turn him human -- and marry him. However, she's dismayed when he doesn't want to settle down. They argue, and he kills her, then casts a spell to transfer her soul into a female doll. Chucky tells Tiffany about an amulet in his grave called the Heart of Dambala, which they need to transfer their souls into human bodies (Where was this in the other movies?). They get a teen couple to take them to the grave with plans of transferring their souls into the pair, but Tiffany comes to realize that they belong dead together, so she stabs Chucky, and the teens shoot him dead. Tiffany gives birth to a monstrous baby, then dies.
The bodies of Chucky and Tiffany are being used in the movie Chucky Goes Psycho, starring Jennifer Tilly. Their androgynous son sees them on TV and seeks them out, using the Heart of Dambala to revive them. He's a mild-mannered geek, though, who has trouble dealing with their murderous ways. Tiff wants to transfer her soul into Tilly, while Chucky targets rapper Redman. They also plan on artificially inseminating Tilly with Chucky's "seed" so that Glen's soul can be transferred into the baby. However, Chucky decides that he wants to keep his doll body, which leads to a fight with Tiffany. Glen, who realizes that he's got a Jekyll and Hyde-ish split personality, comes to his mother's aid and chops off Chucky's head.