The Clown Prince Of Crime, The Joker, returns to commit what appear to be senseless crimes: first he raids a fur salon, where he steals a hairpin from one of the rich patrons, then he pilfers one of the holes from a golf course. The Dynamic Duo, au naturel, are called in to investigate, arriving at Gordon's office just as an inflatable jack-in-the-box sent in by The Homicidal Harlequin is delivered. The Batman deduces that The Joker plans to steal the solid gold golf clubs belonging to the visiting Maharajah of Nimpah and immediately rushes down by Batmobile to the golf course to thwart the villain. Just as The Maharajah hits the golf ball into the hole he's playing, a cloud of colored gas spews from it, knocking everyone unconscious. (As it's revealed, The Joker stole this hole; he used the stolen hairpin as a trigger, and it was struck by the golf ball and activated the sleeping gas smoke bomb cleverly hidden inside the hole.) The Joker's henchmen then sees fit to kidnap the Maharajah (with a forklift, as the Nimpahnese monarch weighs over 350 lbs.!) and spirit him away by van. The Caped Crusader and The Boy Wonder immediately gives pursuit in The Batmobile, but, just as they gain on them, the van, which is covered by folding mirrors which allow it to blend totally into the background, quickly vanishes! Later, Batman and Robin trace The Joker to his GHQ at the abandoned Katz, Katz & Katz Company Oil Refinery, where they are captured and locked inside an enormous chimney. As if this isn't enough, deadly gas starts to pour in!