"A Piece Of The Action"
Green Hornet and Kato come to town and sneak into the Pink Chips Stamp Factory, hoping to expose a counterfeit stamp operation. But everyone believes them to be villains, so Batman and Robin return to the stamp factory the next night, hoping to catch Green Hornet in the act.
Colonel Gumm has a machine that turns people into stamps?
Is their first crossover to be their last?