Mon-El (Arrowverse)

Mon-El (his real name) was a prince of Daxam, sister planet to Krypton. When Krypton was destroyed, fragments of the planet rained down on Daxam. Mon-El's bodyguard put him in a space vessel and sent him away. He drifted in stasis until he arrived on Earth in Supergirl's time. After a serious romance with Supergirl, Mon-El had to leave Earth because of lead released into the atmosphere during the Daxamite invasion. He fell into a time warp and emerged in the 31st century. There, he found a galaxy on the brink of war. He married Imra Ardeen and founded the Legion of Superheroes in conscious imitation of Supergirl, based on the ideals she had taught him. With the 31st century decimated by the Blight, a group of Legionnaires returned to Supergirl's time. Among them were Mon-El, Imra, and Brainiac 5.