Yuya joins the Battle Royale duel and summons Odd-Eyes Pendulum Dragon, which causes both him and Yuto to feel a strange sensation when it resonates with his Dark Rebellion Xyz Dragon. Sora, further angered that Yuto was going easy on him, reveals that he is from another world known as the Fusion Dimension, while Yuto and Shay are from the Xyz Dimension. Sora attempts to summon his next Fusion monster, but is suddenly dragged back to the Fusion Dimension by his Duel Disk. Putting a stop to their duel, Yuya questions Yuto, who explains his that homeworld, the Xyz Dimension, was attacked one day by the Fusion Dimension, who turned its citizens into cards. Yuto further reveals there is also a Synchro Dimension, while Yuya's homeworld, Standard, is the one that connects them all. As Yuya vents that duels are supposed to be used for entertainment instead of war, a portal suddenly opens and a duelist appears, bearing the same face as Yuya and Yuto. (thetvdb.com)