Batman: The Animated Series 58 - Shadow of the Bat, part 2
Robin discovers that Gil Mason is in league with the underworld and goes to investigate him. He encounters Batgirl along the way, who is also trying to get to the bottom of things to clear her fathers name. Each learns, without knowing that the other knows it, that Mason is to meet the mysterious gang leader in an abandoned subway in South Gotham. Theres no love lost between Batgirl and Robin and so they go separate ways, each arriving at the subway station independently. Mason joins Two Face, who has decided to execute Matches Malone. Batgirl tries to stop this, but bungles it, and she, along with Robin and Matches, are trapped in the subway. Two Face floods the subway tunnel.