Speed is chasing a driverless car, but loses it at a railroad crossing. He sees Dr. Krepit there and asks him about the car. Krepit denies that he is the famous automotive engineer, J.D. Krepit, or that he has seen the car in question. Spritle notices the truck is moving. He peeks in the cab and when he sees no one at the wheel, he and Chim Chim faint.
Speed sees the truck and tries to catch it.
Spritle and Chim Chim fall out of the back of the truck. Speed stops and the kids get in the trunk. Speed follows the truck to Dr. Krepit's castle, which looks like the witch castle in the Wizard of Oz. One of the remote controls attaches itself to the Mach Five. The car is on a conveyor belt that leads to a blast furnace where the cars are melted down.