The Demon's Quest (1) Batman: The Animated Series : Season 1 Episode 57

When Robin is mysteriously abducted from his college campus, the Batman begins a fruitless search ... until he is astounded by the sudden appearance in the Batcave of Ra's Al Ghul. Ra's quickly reveals that his daughter, Talia, has been abducted under circumstances similar to Robin's, suggesting that the same persons are responsible. So begins an uneasy truce between the Batman and 'The Demon'.