User blog comment:Iamthelegion/Arnold Schwarznegger vs Goku Black/@comment-3401602-20170316201821/@comment-25263388-20170317020439

Goku Black is the antagonist of the Future Trunks Arc of Dragon Ball Super, an apprentice Kaioshin who stole Goku's body to use its immense power to kill all the mortals (aka ningen), as he viewed mortals as inherently evil, and said that a god idly standing by and letting the mortals commit evil was half-hearted.

In response Goku Black, who was that timeline's Zamasu, killed all of the Kaioshin, which caused the deaths of their attached Hakkaishin, and it is presumed he also killed their angels and the other Kaios for their crimes against godhood. He then used the Time Ring to get another version of himself who gave himself immortality. The two of them made themselves Kaioshin through the use of Potara earings, and went around killing all the mortals they could, though they are known to have significantly struggled against Future Trunks and the people of Future Earth of Universe 7.

Goku and friends first encounter him when Future Trunks comes back to the present in his time machine, running away from Goku Black, after he killed Future Bulma, and Goku Black used the Time Ring (which normally only lets you travel forward in time and back to where you came from) to travel through the rip in space-time caused by that time travel, though after a short fight with Goku he is drawn Back... To The Future!

then plot happens yay