In Batman , Batman and Robin figure out that the tip was an attack baby charged them without warning .
After a tangle with an exploding shark which seizes Batman 's leg but is repelled by shark repellent after the Yacht disappears , Batman and Robin head back to Commissioner Gordon 's office where , through deduction and wisdom , they figure out that the tip was a set-up by The United Underworld , a gathering of four of the most powerful villains in Gotham City ( Joker , Penguin , Riddler and Catwoman ) , who plan to defeat The Dynamic Duo once and for all , and take over the entire world .
Batman -LRB-1966 film-RRB-