Black Goku refers to an antagonist in the Dragon Ball Super series known as Goku Black. This character is a version of Goku from an alternate timeline who becomes evil after obtaining the powers of the godly Kaioshin. Black Goku possesses a dark and destructive demeanor, and his appearance differs from the traditional Goku with a darker complexion and a unique outfit. The storyline involving Black Goku explores complex themes of time travel and the consequences of altering timelines, adding a layer of intrigue and mystery to the Dragon Ball Super narrative.