Zamasu Gattai, also known as Fused Zamasu, is a major antagonist in the anime series Dragon Ball Super. He is the result of the fusion between Goku Black (Zamasu from an alternate timeline) and Future Zamasu using the Potara earrings. This fusion creates an immensely powerful being with god-like abilities and a deep hatred for mortals. Zamasu Gattai serves as the primary villain during the 'Future Trunks Saga,' seeking to eradicate all mortals and become the supreme deity of the universe.