While the resurrected Fred Jones unleashes his army of monsters on Scooby and the gang, Daphne continues to spiral further into guilt and depression, terrified of losing Fred twice. Fortunately, the gang has another secret weapon: Scrappy-Doo and his mysterious mentor. Plus, the trials of Atom Ant continue as another member of the JLA tests the super-insect to see if he's worthy of joining the League!