Episode Title:
Shark Attack.
Episode Description:
As Yuma's friends become curious as to the whereabouts of his Number cards outside of duels, Yuma learns that Shark had been skipping school since their duel. Yuma goes to challenge Shark to another duel, but he tells him that he's quit duelling. Yuma continues to challenge him the next day, getting him to agree to a duel by putting his key on the line, deciding he will try not to use his Numbers. Shark immediately summons out his key monster, Aero Shark, and starts calling on Yuma to bring out his Numbers. Yuma, realising there's more than pride on the line, summons out Utopia, but falls into a play by Shark. Shark then summons out another Xyz monster, Black Ray Lancer, which negates Utopia's effects to not be destroyed, and defeats Yuma, though he decides not to take Yuma's key. His friends get mad at him for using a Number, after he promised he wouldn't.
