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In the near future, high-tech AI toy cars for kids, Watch-Cars, are created. In burst enthusiasm, a battle tournament is formed, the Watch Car Battle League. As the undefeated champion, Kai remains a legend. Jino and his watch-car Bluewill hope to become the new league champions. Meanwhile, the evil organization Shadow attempts to eliminate Watch-Cars with their Monster Cars.
Elementary school student and Robot Racing super-fan Kyle Hughes finally gets the chance to live out his dreams, and joins the League with Alpha, Beta and Theta— the three Tobots built by his mother, Dr. Hughes.
While investigating a string of mysterious car accidents, Dr. Franklin Char is abducted by the perpetrators. This incident activates his creations called "Tobots", cars that transform into robots with a special key called a "Tokey". Dr. Char's first two Tobots, Tobot X and Tobot Y, are entrusted to his twin sons Ryan and Kory, respectively, to fight crime and protect their neighborhood.
Duri is on board while Tayo is doing his route. He shows Tayo his most favorite toy car, ‘Ace’. Tayo envies Duri and Ace’s strong connection. As soon as Duri gets out at his stop, he ends up dropping Ace on the road by accident.