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Ultra Boy
Ultra-Boy often had to struggle between the Legion and his rough upbringing on Rimbor.
Gender	Male
Publisher	DC Comics
Origin	Rimbor in the 31st Century
First Appearance	Superboy Vol. 1 #98
Creator(s)	Otto Binder Al Plastino
Alter ego	Jo Nah
Aliases
Abilities	Flight, Invulnerability, Super-Strength, penetra- vision, essentially all of Superman's powers. However, Ultra Boy needs to consciously activate them, and can only use one power at a time.
Affiliations	Legion of Super-Heroes

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.