Leonardo is the newly appointed leader of the Mad Dogz aka the Hamato Clan. After surviving the prison dimension and defeating the kraang he's been taking his job rather seriously. He’d never want a slip-up like that again. They changed the future with the help of Casey Jones Jr. But what if they hadn't? He got all his brothers killed, and the entire world killed. He can't allow another mistake like that. So the young slider has been doing his best with this hero stuff to make up for everything.