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- For other uses, see Jo.
- See Nah for other articles with titles that contain, either by relationship or by coincidence, this character's surname.
A Rimborian by birth, Jo Nah grew up on the streets of his homeworld, the planet Rimbor. In a universe of that reality's multiverse, he took the identity of Ultra Boy to use his powers gained from a giant space creature to become a member of the Legion of Super-Heroes. (TOS - Legion of Super-Heroes comic: "Issue 3")
|Legion of Super-Heroes|
|Legionnaires||Imra Ardeen-Ranzz (Saturn Girl) • Reep Daggle (Chameleon Boy) • Querl Dox (Brainiac 5) • Rokk Krinn (Cosmic Boy) • Tasmia Mallor (Shadow Lass) • Garth Ranzz (Lightning Lad)|
|Legion Academy candidates||Pol Krinn (Magnetic Kid) • Grev Mallor (Shadow Kid)|
Ultra Boy was not mentioned or described in dialogue, but was seen in one panel of the third issue of the crossover between Star Trek and the DC Comics Legion franchise. In particular, the Ultra Boy seen as part of that incarnation of the Legion would be the "pre-Zero Hour" version of the character. However, no details of his life were part of the Star Trek story, so none of these topics are linked as they are not relevant to this wiki.