"The Duo is Slumming" is the Christmas episode of the ABC series Batman, based upon characters appearing in the "Batman" and "Detective" magazines, aired as the thirty-second episode of the show's second season, continuing from the prior day's episode "The Puzzles Are Coming" ("Same Bat Time, Same Bat Channel").
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The Puzzler continues with his plan to hijack Artemus Knab's new airplane, the Retsoor, all the while leaving puzzles behind for Batman and Robin to ponder. He familiarizes himself with the jet's designs, then prepares to fly his prize to a foreign country where he will hold it for ransom. But the Dynamic Duo have an easier time with his clues than he expected, resulting in a climactic confrontation at the airplane hanger.
