Fan Casting The Batman: The killing joke

Following the events of The Batman: Revenge of deathstroke, The Batman: Knightfall, and Gotham Knights, Bruce Wayne spends two years training his son Damian to become the new Robin and distancing him from his grandfather Ras' teachings while traveling around the world after the long-lost Lex Luthor. But when Lucius Fox is murdered by the Joker and Barbara Gordon gets shot from it, Bruce and Damian must return to Gotham to face the maniacal clown once and for all!