Sodam Yat is a fiction character, an extraterrestrial superhero published by DC Comics. He first appeared in Tales of the Green Lantern Corps Annual #2 (1986), and was created by Alan Moore and Kevin O'Neill. He operated as Ion, having become one of the most powerful characters in current continuity.
Sodam Yat is a prophesied future member of the Green Lantern Corps, created by Alan Moore and is first mentioned in "Tygers", a story in Tales of the Green Lantern Corps Annual #2. He is mentioned in passing to Abin Sur by a demon named Qull of the Five Inversions, who had been imprisoned on the planet Ysmault by the Guardians of the Universe. As a Daxam (a race which descended from Kryptonians with inherent Superman-like powers) with a power ring, he would be nearly unstoppable. Despite this, in Qull's prophecy, he is still defeated as part of the final destruction of the Green Lantern Corps.
Alan Moore planned to use the character in his proposed story, "Twilight of the Superheroes", which went unpublished. In the proposal that was leaked onto the Internet, the Daxamite Green Lantern is named "Sodam Yat" and is also referred to as "The Ultimate Green Lantern". In that story, Sodam Yat is the last of an army of aliens to attack Superman. The Man of Steel defeats many Green Lanterns, Thanagar, and the Martian Manhunter, before finally being killed by Sodam Yat. The character would subsequently go unused until 2006.
As a young boy, Sodam Yat wants nothing more than to explore the stars, but the xenophobic Daxam society forbids it. When a spacecraft crashes on Daxam, Sodam rescues the pilot. The pilot, called Tessog, and Sodam become friends, despite not speaking the same language. His parents discover Tessog and kill him, and then brainwash Sodam into thinking his friend was a violent menace. Years later, while on a school field trip to a museum, Sodam freezes at the sight of an anti-alien diorama, featuring Tessog's stuffed and preserved body attacking a Daxamite. This discovery causes Sodam's true memories to resurface. Enraged and disgusted by what had happened, Sodam rebuilds Tessog's ship, planning to leave Daxam forever. On the night of his departure, a Green Lantern ring comes to him, telling he has the ability to overcome great fear, and Sodam becomes a member of the Green Lantern Corps.
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