Sparky, the high-spirited sports car, is back! This time he's eager for adventure and wants to make some money so he can hit the road. But jobs aren't easy to come by in El Coche and fed up with working at his Dad's Gas and Go, he is persuaded by Diesel, to leave and work instead at Greasy Springs Circus. There is soon trouble brewing though, and Sparky finds out that Diesel is not all he seems. Sparky must stand up to Diesel and race for his life, if he is to ever escape from the Greasy Springs Circus and return home.