Life changes forever for 13-year-old Marnie Cromwell (
Kimberly J. Brown) when she discovers she's a witch. It's Halloween night, and Marnie begs to go out, but her over-protective mom Gwen (
Judith Hoag) never lets her kids celebrate the holiday. When Grandma Aggie (
Debbie Reynolds) shows up with candy, costumes, and a big secret, Marnie learns that she's a witch and that a dark force is threatening Halloweentown, where Aggie lives and Gwen was raised. But Gwen doesn't want anything to do with magic or witches, and sends Aggie back to Halloweentown. Marnie decides to follow Aggie to Halloweentown, along with brainiac brother Dylan (
Joey Zimmerman) and little sis Sophie (
Emily Roeske). In Halloweentown -- a cheery-looking village populated with monsters, goblins, witches, ghosts, vampires, and other freakish creatures – the Cromwell kids decide to help their grandmother track down and eliminate the dark force that's turning the citizens of Halloweentown into zombies. Marnie, Dylan, Sophie, and Aggie work together to uncover the mystery, a hunt that leads them to a terrifying warlock with plans to destroy not only Halloweentown, but the normal (mortal) world as well. Of course, when the kids' mom shows up, she threatens to put a wrench in their plans and send them home again.