Ra's al Ghul
Ra's al Ghul (portrayed by Alexander Siddig; season 4; guest season 3) is the enigmatic person behind the Court of Owls' activities and leader of the League of Shadows. With a past shrouded in mystery, the powerful supervillain uses cunning and deception to lay waste to his foes. His identity is foreshadowed upon the death of Shaman who works for Ra's al Ghul. When Bruce Wayne meets Ra's al Ghul in the bowels of the Yuyan Building, Ra's al Ghul mentioned that he wanted Bruce to be his heir and does a final test where he wants him to kill Alfred Pennyworth. After Bruce stabs Alfred, he angrily tries to attack Ra's al Ghul who gets away where he advises to Bruce to use the Lazarus Pit's waters to heal Alfred.