Mater helps Sheriff enforce the rules of the road when hot rods speed into town.

Starla shows Blaze and AJ some of the wildest racetracks in the Wild West. After discovering a map to the Bouncing Bull Racetrack, Blaze and Starla race through the desert to find it.

After a long day of racing practice, Mater convinces Lightning McQueen to come along as Mater sneaks up on sleeping tractors, blow his horn and tip the tractors. After causing trouble and allowing the tractors to escape, Mater finds a way to fix all the problems he has caused.

When Thomas meets Ace, a race car who was in a round-the-world rally, Thomas follows him to Africa where he meets Nia, a helpful engine who joins him on his trip around the world.