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Ultra Boy is a fictional superhero character, a member of the Legion of Super-Heroes, owned by DC Comics.
Ultra-Boy is considered one of the most powerful Legionnaires, with all of Superboy's powers and more. He is distinguished from his fellow Legionaires Superboy and Mon-El by his unusual vulnerability or limitation of only being able to use one super-power at a time. Also, his penetra-vision, unlike x-ray vision, can see through lead. Jo also has a level of "street smarts" that Superboy, with his relatively nurturing upbringing, could never have.
Origin
Jo Nah grew up on the rough and tumble planet Rimbor. When his teen-aged friends, decided to risk their lives for kicks by buzzing Space Dragons, Jo tried to stop them. He accidentally got swallowed by an Ultra-Energy Beast. When he realized he had absorbed energy from the beast, he was able to locate the energy in different parts of his body, giving him different super-powers. With these new powers, Jo was able to escape the beast and return home. Jo used his powers to help his friends that were involved in high-risk behavior with the gangs on Rimbor. Eventually, he met the Legionaire Phantom Girl, who liked him right away, and decided to try out for the Legion of Super-Heroes.
Ultra Boy's first appearance.
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