Batman corners Joe Chill at an illegal weapons auction. In a pivotal moment, Batman removes his mask, revealing he is Bruce Wayne—the son of Chill's victims.
The episode highlights that Batman's moral code—not killing—is what prevents him from becoming as dark as the criminals he fights. [S2E11] Chill of the Night!
If you'd like to dive deeper into this episode or the series: Batman corners Joe Chill at an illegal weapons auction
Despite the Spectre's urging to kill Chill, Batman chooses justice over vengeance and spares him. Batman removes his mask