Showdown

[Ra's reveals the identity of his captive]

Batman: Duvall.

Robin: It can't be! He'd be over a hundred years old!

Ra's Al Ghul: He was sentenced to fifty years at hard labor. Of course no one expected him to survive that sentence. No one but me.

Batman: The Lazarus Pit.

Ra's Al Ghul: When he was a young man, though even its powers cannot restore him now. When his sentence was completed, Arkady simply wandered away. The privations he had suffered had left his mind shattered. I had lost track of him until he turned up in that rest home.

Batman: You left Duvall to his fate a century ago. Why come back for him now?

Ra's Al Ghul: Did you really think, Detective, that in my 600 years of life, I would've sired only one offspring? Even before the Phoenix debacle, I had come to realize that Arkady was too unbalanced and cruel to wisely rule my empire.

Batman: But you couldn't forget about him.

Ra's Al Ghul: What father can ever forget his son?