A typical greasy mob boss, Rupert Thorne had a run-in with Batman very early on in his career, but wasn't deterred from his life of crime.
In the first episode, Thorne's criminal empire fell apart before super-villains like The Joker appeared in Gotham City. He also made a cameo in the episode "A Matter of Family." In "Rumors," he was one of the captured villains of Rumor.
Thorne played a larger role in The Batman Strikes!, a comic based in the continuity of the show. In one issue, he worked with Bruno Mannheim to create an army of super-villains based on Bane, Man-Bat, and Firefly.