One day, Tayo finds a treasure map in the storehouse. Greedy for the treasure, each of the little buses try to secretly find the treasure on their own. After pretending to go somewhere else, they each look for the treasure to no avail. They realize that they deceived one another and get into a fight.
With Cito's advice, they find out where the treasure is buried. Everyone races toward the place where the treasure is supposedly hidden. When they finally find the treasure chest and are about to open it, Rookie shows up because he was trying to catch them for speeding earlier. After listening to the little buses explain, Rookie opens the treasure chest. What can be in the treasure chest?