Fan Casting Batman: The Legend Begins

Season One= Bruce Wayne's parents are murdered and 27 years later the killer has still not been caught. So Bruce becomes a vigilante to find the killer and is led on the trail of Carmine Falcone. Season 2= After discovering that Falcone was a false lead, Bruce tries a different approach. He eventually comes across the court of Owls, the organisation who gave the order for the kill. Season 3= Bruce thinks his mission is over but that turns out to be the wrong assumption when he is attacked by a member of the league of Assasins, the higher group above the court of Owls. Bruce then becomes Batman once more to kill their leader, Ra's Al Ghul. Season 4= One of the league of Assasins' best members goes after Bruce for revenge for killing Ra's. He wears a mask and calls himself Deathstroke. But who is he really?