Batman: The Animated Series S03E02 - Second Chance

Just before he is to undergo the operation that will restore his sanity, Harvey Dent is kidnapped by a mysterious villain. Batman and Robin split up to nab the criminal behind the scheme to abduct the Dark Knight's old friend. They suspect that either the Penguin or Rupert Thorne may be behind the kidnapping. But is it really the Penguin or Thorne behind the kidnapping? Or is it someone else with a grudge against Harvey?