When Batman (West) and Robin (Ward) get a tip that Commodore Schmidlapp (the final role of actor Reginald Denny) is in danger aboard his yacht, they launch a rescue mission using the Batcopter. After a tangle with an exploding shark, Batman and Robin head back to Commissioner Gordon's office where, by case of deduction and wisdom, they figure out that the tip was a set-up by four of the most powerful villains ever (Joker, Penguin, Riddler and Catwoman), who unite to defeat the Dynamic Duo once and for all.