Kal-El (UE-44)

"I know everything there is to know about the Last Son of Krypton. Where I come from, let's just say the two of us have history."

- Captain Luthor on Superman

Kal-El is an enemy and a Kryptonian superhero known as Superman.

History with Captain Luthor
At some point prior to the Crisis, Kal-El and Luthor became enemies, making Luthor knowing everything about him including Kal's true identity, weaknesses and powers.

Powers

 * Kryptonian physiology: As a Kryptonian, Kal-El has multiple powers.
 * Flight: Captain Luthor's exosuit was built with flight functions as a countermeasure against Superman's power.
 * X-Ray vision: Captain Luthor's exosuit was built with lead in order to block Superman's X-Ray vision.
 * Heat vision: Captain Luthor's exosuit was built with enhanced durability as a countermeasure against Superman's heat vision.
 * Super breath: Captain Luthor's exosuit was built with enhanced durability as a countermeasure against Superman's super breath.
 * Super strength: Captain Luthor's exosuit was built with enhanced durability as a countermeasure against Superman's super strength.

Weaknesses

 * Kryptonite: According to Captain Luthor, Kryptonite is a radioactive element from Krypton that weakens Kryptonians.