- See Krinn for other articles with titles that contain, either by relationship or by coincidence, this character's surname.
In the Legion's reality, his homeworld of Braal was a member of the United Planets, an interplanetary organization centered on Earth. Krinn, possessed of natural magnetism capability of his race, was able to prove himself a hero by helping to save an influential businessman from assassination. In gratitude, Krinn, and fellow samaritans Imra Ardeen and Garth Ranzz took on heroic code-names and were sponsored into a hero club, the Legion. The Legion grew into a large organization of powerful youths with non-Human abilities.
While time traveling with Ardeen, Ranzz, and fellow Legionnaires Querl Dox, Reep Daggle and Tasmia Mallor, Rokk Krinn's time bubble was destroyed by a time distortion. The party of Legionnaires, who had been trying to return to the late 30th century, found themselves in the 23rd century of another reality where an Imperial Planets organization ruled Earth. (TOS - Legion of Super-Heroes comic: "Issue 1"
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|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)|