Jon Lane Kent

Jon Lane Kent is a version of Jon Kent from a different universe. He was both a friend and a foe to the Teen Titans before seemingly dying, although he's returned and was in Lex Luthor's hands before being taken by The Outsiders

History
He was born under a yellow sun and as such showed great power from a young age. But about three weeks before his forth birthday he fell serverly ill and no one could cure him, from Clark to Lex many made an effort but Jon seemed to have died.

In truth though he was taken by the time traveler Harvest who was able to cure him using advanced future medicine and tech. Harvest then raised him as a weapon in his on going war against all meta humans on earth. Hate and anger made him the perfect weapon.

His genes weren't very stable though and he'd quickly be falling ill again. So Harvest sent him to fetch Kon-El since Kon was the perfect mix of man and kryptonian. Jon was supposed to just end up in the past but due to the strange universe fluid-ness of Superboy he landed himself in both the past and a different universe. Although he didn't realize it.

He then came to clash with the Teen Titans in his efforts to kidnap Kon. They manged to beat each other pretty badly and Kon was left unconscious. Jon was too weak at the time to actrally go through with his plan and the Titans were well on their way. So instead he grabbed Kon's jacket and then tossed some rubble on him so the team wouldn't notice him.

He manged to get into the team without any major hiccups and came up with a plan to prevent his own future. He'd just kill all the meta humans now and figure out a cure for himself. He didn't realize Raven had figured out the truth and only hadn't told the team because she wanted to see if he'd change.

Jon might have grown to care about his new teammates more than he'd like to admit.

This universe version of Harvest soon showed up having kidnapped Kon. This is when Jon realized he wasn't in his own universe. A fight started and Jon had one thing on his mind, getting rid of Harvest so his evil wouldn't ever happen in this universe. He manged to get Harvest within an inch of his life before Harvest used some emergency time travel tech he had.

Jon wasn't seen for a year or two afterwards and it was presumed that he must have died.

He later reappeared being kept locked away in a Lexcorp owned faciltity, Lex was interested in who this Superboy was, and more importantly how dangerous he was. The Outsiders broke him out where he then ended up in Batman's custody briefly due to how dangerous he is. Young Justice along with some of the members of The Outsiders then broke him out and took him to the Justice League tower. He is now living there and being monitored.