Justice League (2001)

S1E16 Injustice for All (1)

After being revealed as a criminal and facing imprisonment while suffering from a terminal illness caused by prolonged kryptonite exposure, Lex Luthor manages to break free. He recruits a formidable group of supervillains, including Cheetah, The Shade, Solomon Grundy, Star Sapphire, Copperhead, and Ultra-Humanite, to form the Injustice Gang, aiming to challenge the Justice League. The Joker joins the group voluntarily, adding to their chaotic dynamic. However, their alliance quickly falters as Batman's cunning strategies expose their critical vulnerabilities, leading to their downfall.