Series 1: 5. It's Mean, It's Green, It's the Mystery Machine

The Mystery Machine gains a life of its own and starts to drive by itself, so the gang tries searching for clues to figure out why. This leads them to the Mystery Kids, a band of talented kids who formerly owned the Mystery Machine. While trying to solve the mystery, the van rampages out of control all over town, and Shaggy and Fred nearly get arrested by a police officer.