Comments: Super-powered teens from across the cosmos, gathered together on Earth as the Legion of Super-Heroes to defend the Universe against evil!Near his homeworld of Rimbor in the 30th century, Jo Nah's one-man spacecraft was attacked by an alien energy beast, which filled him with its ultra-energy, giving Ultra Boy the ability to use one super power at a time: super-strength, speed, invulnerability, flight, or super-vision of several types.