After finding out that the heroes are alive, Luthor weakens Superman with kryptonite instantly knocking him out. When Superman and Batman find him building a large robot, Luthor reveals that he plans to use all of Joker's gas to control the citizens to follow his command. However the villains outrun them reaching Metropolis, where Luthor quickly constructs a giant robot that resembles Joker. Luthor and Joker continue to Metropolis, but are followed by Superman and Batman. Batman steals a small amount of the fake kryptonite and takes it with him to the Batcave, where he finds out it is actually tracking device, soon after which, Lex Luthor and the Joker attack the Batcave leaving it in flames. Batman and Robin fight past the LexBot and confront the villains but they are quickly thrown away. Luthor's LexBots fight the duo delaying them and giving room for the villains to escape and for the Joker make fake kryptonite. The heroes are aided by Superman who rescues them but leaves once Batman and Robin chase Lex Luthor and Joker through Gotham City.

While the Dynamic Duo fight with the other escaped criminals, the Joker and Luthor invade the Ace Chemicals Plant and cause a large fire, which attracts Batman and Robin to investigate. Joker agrees to aid Lex Luthor with his plans and together they free many other inmates. Once Batman and Robin imprison Joker, Lex Luthor frees Joker and plans to use his laughing gas for his own needs. The plot begins with Joker attacking the Man of the Year award along with Two Face, Penguin, Riddler, and Harley Quinn.

Lego batman 2 game villains list