Dragon Ball Super has spent much of its time expanding both the cosmos and the mythology of the Dragon Ball universe. As if 11 other universes each possessing their own Gods of Destruction, Angels, and Supreme Kai weren't enough, the series decided to bring time travel back into the mix for its most complex villain origin story yet. Goku Black's appearance in the Future Trunks timeline is complicated, to say the least. The body-swapping, time-traveling, multiverse-hopping villain has likely made more than a few viewers pause to grab a pencil and paper.
Source：https://www.cbr.com/dragon-ball-super-goku-black-explained/
