Being a clone of Leonardo, Dark Leo is the leader of the Dark Turtles. In his first appearance during Bad Blood, Leo tries to talk to him, saying he has to have honor if he's truly his clone. Dark Leo himself admits that he and the other Dark Turtles have many similarities to Leo and his brothers, but says honor and value aren't one of them. His brethren flee, leaving him behind only to be taken care of by the Turtles and Cody. They don't risk anything though and keep him in a force field laser grid in the medical bay.