The Autobots must stop a colossal planet-consuming robot who goes after the Autobot Matrix of Leadership. At the same time, they must defend themselves against an all-out attack from the Decepticons.

Join Scooby-Doo, Shaggy and the Mystery Inc. crew as they head to Chicago for a talent show, some museum tours and a whole lotta pizza! The windy city is home to the hit TV show, Talent Star, in which songwriting duo Fred and Daphne are finalists with some high hopes. Not to be left out, Scooby and Shaggy have a secret act in the works, which they are betting will take the contest by storm.

Tom is left in charge of a priceless magical ring, he becomes horified to find this enchanted ring has become stuck on Jerry's head. Jerry takes off for the city and Tom has to go out looking for him in order to return the ring. The sorcerer's ring begins spouting out a torrent of mischievous magic.