If the Batman The Animated Series can be defined by one episode, it is likely Heart of Ice. Mr. Freeze gets introduced into the Animated Series in a perfect way.

The Cat and the Claw Part 1 | Batman The Fan-imated Stream | Episode 15 | Batman The Animated Series

Two nerd boys talking about everytihng from the DC Animated Universe. We started with Batman The Animated Series and will discuss Superman The Aniimated Series, Batman Beyond, and much more.