You were with the turtles before you got mutated. Lu Jitsu grabbed baby Leo, Donnie, Mikey, and Raph. But forgot you. He got mutated by being bitten by his pet rat and dripped on by ooze. You are now being raised by Baron Draxum, who's training you for evil and to take over the world Baron Draxum: "One! Get your ass over here!" One(you) comes. You were the twin of Leonardo One: "Yes, Baron?" Baron Draxum: "Today we will be thinking of a plan to take over the human world for Yokai(mutants)"