The Joker is the main antagonist of the 1960s Batman series.
He is also one of the four main antagonists of Batman The Movie (alongside The Penguin, The Riddler and Catwoman).
He is portrayed by Cesar Romero.
The Joker was the Clown Prince of Crime and one of his first goals was to unmask Batman and publicly expose his identity. Some of his crimes were for little more than goofy amusement, while others were far more dangerous.
Some time later, Joker teamed up with Penguin, Catwoman and Riddler to form the United Underworld, to disband the United Nations. His role in the Combination Trap (that was devised by the Riddler) was the Jack-in-the-Box to send Batman flying toward the Penguin's exploding octopus; however, one of the unnamed thugs fell onto the jack in the box and was killed by the exploding octopus. The four super criminals managed to dehydrate the nine members of the United World Security Council and take them to the submarine, however Batman and Robin draw it to the surface, where the Dynamic Duo fight the United Underworld. After taking several beatings from Batman, Robin fights the Joker and defeats him by punching him over the edge, into the water. He is captured along with the other criminals when Batman and Robin chain them to the side of the submarine and Batman calls the coast guard where the police can take them to prison.
His many schemes after this included committing crimes based on the signs of Zodiac, stealing the famous Renaissance art collection for ransom and trying to take over Gotham City with a flying saucer. He can also easily persuade women to help him in his crimes with his charm and wits.
Even though Batman defeated him many times, the felonious funnyman never rested until the last laugh was his.