Johnny Randall is forbidden to go near a race track by his mother, who is still grieving the loss of her husband, a champion driver that perished in an accident at the Indianapolis Speedway. He goes to work for his dad's former mechanic, Breezy Bradley, who now repairs midget racers in California. Johnny is tempted into the track and everyone is amazed at the boy's ability. To conceal his identity from his mother, Johnny dons a mask, and a mysterious masked driver wins every major race. Things are going great, until a rival team orders its drivers to deliberately send Johnny into a fiery crash. (jakelijan virallinen teksti)