Jo Nah

In the 30th century, Rimboran teen Jo Nah was swallowed whole by a space-dwelling ultra-energy beast, and the creature's radiation granted him a vast array of Kryptonian-level abilities — though he can only use one power at a time. Taking the name Ultra Boy, he went on to join the Legion of Super-Heroes.

Few Silver Age debuts have proven as enduring as Jo Nah, who first leaped off the page in Adventure Comics #304 in 1963, conjured by the legendary Jerry Siegel and artist John Forte. A fixture of DC's far-future corner of the universe, Jo Nah has shared adventures across more than six decades with luminaries like Saturn Girl, Imra Ardeen, Querl Dox, and Brainiac 5 — the kind of cosmic company that signals a character woven deep into the fabric of Legion mythology. With 131 catalog appearances spanning Legion of Super-Heroes, Adventure Comics, and Tales of the Legion of Super-Heroes, plus nine key issues to their name, this is no background player — Jo Nah is a Silver Age original whose presence has resonated across generations of DC storytelling, making them essential reading for any serious Legion enthusiast.