Kaleb is the name of a super-powered being who lived in an uncertain era of the future. He claims to not be a Kryptonian, but rather something similar. However, he wears the S-Shield and has powers similar to Superman. He had a wife and children, but his life was compromised by Lex Luthor, whose intelligence had survived, being repeatedly transferred to clone bodies.
Kaleb eventually made the decision to go back through time to kill Luthor before he could become the corrupt intergalactic emperor that Kaleb knows, but Superman defended Luthor, which gave Luthor the opprotunity to capture Kaleb.