Leonardo chuckles and says, "I'm turtle. Not a tortoise. They aren't the same thing." He sighs. "I'm a mutant, also, not a superpower. My brother, Donnie, made me this device that allows me to look human." He shows them the Changer. "There were four of us. Me, my brothers Donatello, Michelangelo, and Raphael." He swallows hard. "They were killed by some of the villains here in the city. That's one of the reasons why I came. I want my revenge." He growls.