Goku Black and Zamasu fused. The god who wanted to wipe out all mortals from all 13 universes.

 

"I am Zamasu. I am the wisdom, the law and the power of the universe!"

The dark version of Goku gave viewers a chance to see just how dangerous Goku would be if he ever turned evil. Considering that fans have already witnessed Evil Vegeta on multiple occasions, it seems only fair that Goku would get the chance to turn on humanity.Fans of the series know that Goku Black isn't just evil Goku. In fact, Goku Black is even more dangerous than that. This iteration of the beloved shonen protagonist is the result of a Kai using the dragon balls to wish for Goku's body. With Goku's strength and the Kai's knowledge of the universe, this character is as dangerous as they come.