Dragon Ball Super (2016), S01E064: Revere Him! Praise Him! Fusion Zamasu's Explosive Birth!
Vegeta continues to overpower Goku Black. Future Zamasu attempts to intervene, but Goku cuts him off. Goku Black realizes that Vegeta's increased power comes from his anger. Goku Black uses that method to increase his own power. Goku and Vegeta gang up on Goku Black, while Future Zamasu goes after Future Trunks, Mai, and Bulma. Bulma attempts to buy time for Trunks to prepare the Mafuba by flirting with Future Zamasu, but he does not buy it and knocks her out. This angers Future Trunks, who powers up to his new Super Saiyan form. He uses the Mafuba on Future Zamasu. The Mafuba works. Future Zamasu is sealed within the jar. However, in the present, Kame-Sennin realizes that he forgot to give Goku the paper amulet that would make the seal permanent. As a result, the seal fails and Future Zamasu breaks out of the jar. However, he loses a lot of his energy as a result. Goku Black goes to help him. Goku and Vegeta follow in pursuit. Realizing that they have underestimated their enemies, Goku Black and Future Zamasu use their Potara earrings to fuse into a single being known as Fusion Zamasu, who possesses incredible power.