President Superman's History
Kalel is the Superman of Earth 23. In his civilian identity, he is Calvin Ellis, President of the United States of America.
Origin
Years ago, the planet Krypton was annihilated in a cataclysmic explosion, leaving almost nothing left. Shortly before the catastrophe, young scientists Jorel and Lara managed to rocket their infant child, Kalel, into the depths of space, where he would eventually land on the planet Earth. Found by the poor but kind Ellis family, who christened him Calvin, he was raised to stand up for himself no matter the odds, and to fight for what's right. When his star-spanning Kryptonian powers emerged under Earth's yellow sun, he became Superman, champion of the oppressed and defender of peace around the world.
Superman would fight many battles against the likes of Lex Luthor, construct the citadel of Fort Superman, and inspire a generation of superheroes by his emergence who would form the Justice League. But his greatest adventure of all may be, in his identity as Calvin Ellis, becoming the President of the United States of America, where aided by his long-suffering assistant Courtney and the reprogrammed alien intelligence Brainiac, he works to protect the world with political as well as superhuman might.
Final Crisis
During the Final Crisis, this Superman was recruited by the Supermen of the Multiverse to help battle the vampire god Mandrakk, and later helped to stabilize conditions on New Earth.
The New 52
Curse of Superman
After fighting a particularly easy battle with his nemesis, Lex Luthor, Kalel realizes that Luthor served only to distract him from his true hidden possession, the Transmatter Sonic Array. As soon as Superman finds this device, three humans barrel out from its entrance. One of them dies, another lies motionless, and the third fires a Kryptonite laser at Superman, but it has no effect. Superman disarms the woman and asks about her situation.
She tells him that she's on the run from a monster named Superman. She reveals that she's from an alternate universe where this monster was the creation of herself and her friends Clark Kent and Jimmy Olsen, a thought-powered being built to inspire and save the world bought out and corrupted by the mega-company Overcorp; rampaging across the Multiverse to eliminate other Supermen, "Superdoomsday" already butchered the pint-sized Superman of Earth 42 and Optiman of Earth 36, with its fleeing creator expressing doubt Calvin would prove any different. Soon enough, the monster bursts through the portal device and attacks Superman. With the help of the woman and an unconventional ally in Lex Luthor, they defeat the monster and send him back through the portal, seemingly tearing him to shreds.
Summoning the Justice League, Superman explains what the device is and asks them to analyze it as he finally introduces himself to the woman. She introduces herself in turn as Lois Lane, and says that he must be Superman done right.
Multiversity
After disabling a robot from another universe, Superman went to the Justice League satellite to have the wreckage examined. The presence of the non-universal material activated Luthor's Transmatter Array, and unwittingly speaking the codeword "S.O.S." transported Superman to the House of Heroes, where he was greeted by Captain Carrot of Earth 26. Meeting with a gathering of several other heroes throughout the Multiverse, the Thunderer of Earth 7 explained that a powerful threat known as The Gentry had destroyed his universe; Superman used Brainiac equipment in his belt to reactivate the station's A.I., Harbinger, which informed them how to traverse the Bleed via Shift-Ships, which Superman's experience with music aided him in operating. He led a party with the intention of rescuing Monitor Nix Uotan from the Gentry on Earth 7, only to find themselves on Earth 8 and confronted by the Retaliators. Before they could come to an understanding, Uotan was reborn from a cosmic egg as the Dark Monitor, corrupted servant of the Gentry.
Superman, having heard stories of the Monitor in his travels, attempted to get through to Uotan, but was rebuffed and joined in the battle to stop him. After Uotan was disinfected and the heroes of the Multiverse defeated the Gentry, Superman led a small party to Earth 7, where they confronted the Gentry's master, the Empty Hand. Superman expressed doubt for the Empty Hand's expressed intention to destroy the superheroes once and for all at a later date, noting that many such villains had claimed they would before, at which point the party was teleported back to Earth 8. The heroes of the Multiverse, now led by Superman, agreed to work together to defend against the Empty Hand's coming attack, with a small group made up of Superman and several other heroes forming Justice Incarnate.
DC Rebirth
When the Supermen of the multiverse were being hunted by the Prophecy, the Justice League Incarnate met with Kal-El (New Earth) and Kal-L (Earth-30). Kalel and The League warned the Supermen of the incoming danger and aided them to find Kong Kenan, the Super-Man of China. The group returned to the House of Heroes, where Superman took the Ultima Thule to the Prophecy to enact his plan as bait, as well as creating a beacon where the other captured Supermen were taken. The House later received a signal from the Thule, and Red Racer mentions to the group that was their only vessel and building another one would take thousands of years; so he sacrificed himself to build a new one, shocking everyone, but luckily his plan worked and they managed to save the Supermen.
