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Jo Nah is the real name of Ultra Boy, a member of the Legion of Super-Heroes.

While traveling in space, Jo Nah's ship was swallowed by an energy beast. He was cut out by a Galactic Patrol Cruiser, but not before he was suffused with radiation from the monster. Jo Nah found the radiation allowed him to be super-strong, invulnerable, super-fast, or see through anything, including lead. The only limitation was that Jo Nah could only possess one of these abilities at a time. Calling himself Ultra Boy, Jo Nah applied for and was accepted as a member of the Legion of Super-Heroes.

Ultra Boy faked a criminal past to gain the trust of space raiders at one point in his Legion career. He was expelled during that time and only after being persued by his Legion teammates and defeating the raiders, was he reinstated.

Ultra Boy is romantically involved with Phantom Girl.

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