In Batman , The United Underworld is a gathering of four of the most powerful villains in Gotham City , who are Joker , Penguin , Riddler and Catwoman , an d they plan to defeat The Dynamic Duo once and for all and take over the entire world .
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 , an attack baby charges them without warning .
Batman -LRB-1966 film-RRB-