Episode 58 - The Secret of Black and Zamasu

Synopsis: At Capsule Corporation, Bulma nurses Goku, Vegeta, and Future Trunks back to health. Beerus and Whis arrive with Kaiƍ-shin. After listening to what happened in the alternate timeline, Whis posits a theory as to what exactly Zamasu is planning. He believes that, after losing to Goku, Zamasu became obsessed with Goku and his incredible power. Zamasu needed an ally as powerful as Goku to achieve his goal of obliterating mortals. Goku Black was therefore supposed to be a copy of Goku, created using the Super Dragon Balls.