Ep. 67: Don Thousand usa a Rede Numeron para invocar Numeronius, forçando Yuma e Astral a se tornarem ZEXAL.

67

Don Thousand, who can freely rewrite cards to his desire, has pushed Yuma and friends into a corner with the power of the Numeron Code and the Field Spell "Numeron Network". Then, Don Thousand Summons the terrifying monster "Numeronius" which has 10000 ATK, and places the whole world in the mercy of his grasp! In order to escape from this horrifying dilemma, Yuma and Astral combine into ZEXAL, frantically pulling all the stops offensively and defensively! And in the middle of this struggle, the true origin of the "Numbers", which has been shrouded in mystery, is finally revealed... (Source: Yu-Gi-Oh! Wiki)