Following clues from The Joker's vandalization of key-like objects around Gotham (tearing up a book, cracking a record, burning a file and lopsiding a sign), The Caped Crusader and The Boy Wonder head to Angus Ferguson's rare key exhibition. There, Joker steals The Jeweled Key Of Kaincardine with the aid of his new invention, a mysterious little spark-spewing box which leaves The Dynamic Duo completely helpless while he escapes with The Key. Ferguson is furious. Later, Batman and Robin follow a televised clue by The Joker and they trace The Homicidal Harlequin to a fur salon, where they encounter the pasty-faced clown and his henchmen.

Batman & Robin capture the mysterious device dropped by the departing Joker, which turns out to be nothing but from a sparkly diversion to help Joker practice hypnotic suggestion! Back in The Batcave, The Batman uses The Batcomputer and a phone book to find Joker's hideout. The Dynamic Duo proceed by Batmobile to the place--resulting in instant capture by The Joker, who places Robin inside a spray wax machine while Batman is strapped to a giant key duplicator!