Injustice League

Out to wreak havoc on the seriously super squad Justice League, DC Comics' Injustice League was first formed by interplanetary conqueror Agamemno, who used his powers to switch his eight members minds with that of the Justice League. Though the Injustice League were eventually forced out of the people they embodied, the damage had been done - they knew their counterparts inside and out, which forced the Justice League to use the H-Dial to switch their identities. The league has taken lots of forms since then and has included major Supervillains including Catwoman, The Joker, Harley Quinn, the Penguin, Lex Luthor and Bane. A truly formidable force!