Grant Wilson is the brother of Joseph Wilson and the younger son of Slade Wilson in the show Arrow. In a distant future, he is the arch-enemy of Oliver Queen's daughter Mia Queen.
On Earth-1, Grant was growing up without a father but his group was defeated by Team Arrow and their allies. In Earth-16, he is from an alternate timeline, he is the second person to take on the identity of Deathstroke after his father. He was defeated by Oliver Queen, John Diggle Jr (second Green Arrow) with assistance from Sara Lance and the other members of the Legends of Tomorrow