10 Best Times Supervillains Switched Sides

3. Lex Luthor - Final Crisis

Lex Luthor hates Superman. It's just a fact of life. So why would he, in Final Crisis, decide to team up with the Man of Steel?

The answer is relatively simple. In the long tradition of DC crises, Final Crisis - Grant Morrison's discombobulating epic that involved Darkseid acquiring the Ant-Life Equation and cosmic vampires - threatened to destroy the entire universe, and Lex Luthor, obviously fond of having a universe to exploit, and not particularly willing to take orders from others, was not overly fond of the concept, and so decides to become a mole within the Secret Society in order to thwart Darkseid once and for all.

He takes on Libra - Darkseid's prophet - stops the Anti-Life Equation from being spread and then joins Superman in battle against Darkseid's hoards. This earns him a nice little PR boost, before he goes along with the plot to recreate the universe without Darkseid by using the Miracle Machine.

Lex has of course dabbled with heroics afterwards, but you won't find a better example of him using his powers for good than Final Crisis.