This is the House of L version of Superman.
Landing on EarthEdit
As in the main universe, Kal-El was sent to Earth in a ship by Jor-El on Krypton. However, in this reality, his ship was discovered by Lex Luthor. Luthor adopted him, and raised him as his own child. Lex named him Lionel Luthor.
As Lionel grew older, he started to develop amazing powers. Lex had him train in every kind of martial art in the world, thus making him an unstoppable fighting machine.
At age 21, Lionel decided that he was going to stand by his father in ruling the world. He decided to use the name Superman, and become his father's personal guard. Lex put him in charge of the military. Superman has faced Batman's Justice League on numorous occasions.