Lex Luthor

Lex Luthor is the main enemy of Superman in the Superman comics and media. He is intelligent and very tricky. Lex's evolution from a mad scientist in Golden Age to a billionaire turned villain in the Silver Age is one of the greatest changes in comic book hisory.

Personality
Lex Luthor is a complete megalomaniac. He seeks to control everything he sees due to a delusional sense of entitlement. With no sense of empathy, he cares nothing for his fellow man and only keeps people alive if they benefit him.

Superman Returns
In Superman Returns, Lex Luthor tries to take over the world by destroying some of the earth and creating a huge land mass which everyone will have to pay a big amount to live there. He sneaks behind Superman's back to an arctic region that Superman often visits, and he finds out how to access the main computer that will tell him anything he wants to know about Krypton. After that, he finds and steals some Kryptonite so that he use it against Superman, knowing that it makes him weak and deprives him of his powers. Also some of the Kryptonite he stole he put in the substance that helps make land. By doing that he was able to make a land mass that Superman would be powerless on. So Lex was able to get in close and stab Superman in the stomach with a shard of Kryptonite. By doing that, he nearly killed Superman and became rich.

Mortal Kombat vs DC Universe
Lex Luthor was potrayed as a playable character in Mortal Kombat vs. DC Unverse.

DC Universe Online
Lex Luthor is a major antagonist in DC Universe Online and acts as the mentor for villains who choose the path of the "metahuman" (genetic-based), he is also notable as being one of the prime villains of an alternate future in which he successfully kills Superman only to have Earth invaded by Brainiac.

Knowing that he had doomed humanity future Lex returns to the modern age and coats the world in exobytes that unleash a new generation of heroes and villains - despite this the modern Lex decides to exploit the situation for his own insidious goals.