Batman TAS: Heart of Ice. (Mr Freeze introduction)
A vengeful Mr. Freeze hatches a plot against Ferris Boyle, the uncaring businessman who inadvertently created him. This is a condensed version of the episode in a tribute form. You can watch the full episode (legally) here.
In 2005, Wizard Magazine selected Heart of Ice as the best episode of the BTAS series. They are correct.
Tags: Batman, Batman The Animated Series, Justice, Mr Freeze, Sad, Snow