At the end of Final Crisis, Superman is facing the Female Furies and the Justifiers. Who saves him and reverses the Anti-Life Equation? Lex Luthor and Dr. Sivana.
Lex:"Not a single word, Superman. We'll call this the Historic First Team-Up of the forces of "Good" and the forces of "Bad". And I'll take the credit for the win"
Superman:"Whatever you say, Lex. Whatever you say."