*Young Justice/Smallville Crossover AU Featuring Time Travel and De-Aging Elements*
Nine months before the events of July 4th and the formation of the Team, Superman aka Kal-El disappeared for a week before suddenly reappearing as if nothing happened. Suspecting something is wrong with his friend, Batman confronts Superman only to discover he's a clone; a backup plan created by Jor-El's consciousness in the Fortress of Solitude to stand in for Superman until the real Kal-El's recovery and subsequent return. The problem? Lex Luthor got his hands on Kal-El and subjected him to varying experiments inside the depths of Cadmus. With his memories permanently destroyed, his age regressed, and his powers damaged, Kal-El, now known as Project Kr, is found by Robin, Kid Flash, and Aqualad and is labeled a clone of the Superman.
Unable to return to being Superman, Kal-El, now know as Connor Kent, is forced to take on a new identity while the clone Jor-El sent is left to take Kal-El's place permanently. Having been relieved that Kal-El never settled down, Batman is left having to make the tough decision of keeping his best friend's new condition secret, even from Connor. With only Batman, Clone Kal-El, and Jonathan and Martha knowing the truth, Connor is left to relive his teenage years and on in a completely new way from his Smallville years.
With everything from seasons 1-4 of Young Justice taking place, it is only a month after Connor and M'gann's wedding that M'gann faces off against a new magical foe obsessed with time. Getting hit by a new combination spell, M'gann is physically de-aged to sixteen (her psychic prowess keeping her memories intact) and flung back in time to Smallville, Kansas. All the way back to Clark Kent's first day of high school and the day he first meets and saves Lex Luthor. With a shocking discovery, M'gann is left reeling and seeking help from her future-past husband and in-laws.
*Supermartian set in Smallville w/ Connor as Clark Kent*