Children's animated adventure following DC Comics superhero Batman (voice of Jason O'Mara). Batman discovers that he has a long-lost son, Damian Wayne (Stuart Allan), who has been trained to fight for his grandfather, the vigilante's enemy Ra's al Ghul (Giancarlo Esposito), in the League of Assassins. After Ra's al Ghul is killed, Batman attempts to prevent Damian seeking vengeance, hoping that he can set him on the straight and narrow.