The Adventures of Batman S01E07 - The Nine Lives of Batman

Catwoman traps Batman and exposes him to a radioactive gas that will allow her to identify him in his secret identity.

This episode features edited dialogue - in the show's syndicated run, as Catwoman and her henchmen pillage a jewelry exchange, it includes a line of narration, "The feline felon and her terrible tabbies indulge in an orgy of stealing." This was changed in subsequent prints to "a spree of stealing."