As The Dynamic Duo depart in their Batmobile, Batgirl tries to rev up her Batgirlcycle, but it refuses to start. Joker and Catwoman leap from the bushes, and reveal to her that they swiped the spark plug from her beloved bike, preventing it from working. They then capture Batgirl and tie her up on the front lawn with deadly Cat Whiskers (Holy Bondage!), which when exposed to body heat will contract and strangle her to death! After Joker and Catwoman leave, Batgirl uses her nose to activate the lawn sprinkler, causing The Cat Whiskers to expand and spare her life. She then hurries to Gordon's office and arranges to meet Batman and Robin at The Grimalkin Novelty Company. Arriving at the archcriminals' hideaway, The Dynamic Trio overhear the villains' entire plan. The fiends depart for Phoney Island to find the secluded gunpowder, unaware of The Trio are dogging their every move! Later, at Phoney island, the villains find the gunpowder is hidden somewhere inside the lighthouse. While searching the house, The Trio ambush and try to apprehend the crooks, when The Joker, trying to make a break for it, trips a switch, accidentally revealing the gunpowder!

Without thinking the Joker lights a match so he can examine the gunpowder more closely, and as Batman wrestles the match away from him, it is unwittingly tossed into the gunpowder and sets it off! Batman quickly protects everyone with Antiblast Batpowder, and as The Trio prepares to deliver the criminals to the pokey, The Catwoman demands legal aid: Lucky Pierre, who has never lost a case (Holy Perry Mason!). Later, in court, Pierre refuses to crossexamine any of Batman's witnesses, despite the latter acting as prosecutor. Unknown to The Caped Crusader, the entire jury has secretly been replaced with Catwoman's former henchmen, who issue a dishonest not-guilty verdict! (Holy Fixed Jury!) Unfortunately, the jury foreman loses his disguise at the end of the trial, and, after Batman recognizes him, pulls a machine gun! Batman quickly disarms the gunsel, The Joker and his men rise to battle, and the crooks are rounded up. Lucky Pierre finally loses his first case, and he angrily discards all of his lucky charms and storms out.

Later, Louie The Lilac surprises Barbara Gordon @ The Gotham Library...