Although the gang (unnamed at this point) had successfully solved another case, they were arrested by Sheriff Bronson Stone for interfering (again) in their official police business. He told them that he would inform their parents, whom by now he had on speed dial. They didn't let this stop them, though, as they took to solving the case of the Slime Mutant, revealing him to be their teacher, Prof. Emmanuel Raffalo.
When Scooby was sick, the gang tried to comfort him. Once Scooby fell asleep, he dreamed that he (and the gang) were at the Mystery Solvers Club State Finals. The sidekicks met and took their seats. While Principal Quinlan was trying to speak, a mean looking fire-headed villain known as Lord Infernicus appeared. Lord Infernicus, took the rest of every gang except the sidekicks, So the sidekicks began going to look for clues at the school.
After discovering Angel's truth, they decided not to trust her and went to solve the mystery of the Freak of Crystal Cove. Working together, they apprehended the Freak and unmasked him revealed to be Mayor Jones, who revealed to everyone of his past and to Fred that Brad Chiles and Judy Reeves are his real parents.
Hearing the truth, Fred was devastated. Then he decided to disband the Mystery Incorporated and break off his engagement with Daphne,which broke her heart. Then the gang left, leaving Scooby-Doo who saw Pericles holding the two disk pieces. After having a conversation with him, Scooby had vowed to bring back the gang together again to go after him no matter what.