As Halloweentown prepares to celebrate its 1,000th anniversary, Marnie Piper and her brother Dylan return to Witch University, where trouble is in session from the Sinister Sisters and from someone who’s plotting to use Marnie’s powers for evil.

Paul, a computer whiz who spends more time with his machine than with his girlfriend, finds that he has been chosen as a worthy opponent for Mestema, and evil wizard who has spent centuries searching for a challenging foe. After having his computer changed into wristband weapon, Paul does battle with a variety of monsters before finally coming face to face with the ultimate adversary.