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Cosmic Boy is a member of the Legion of Super-Heroes.

Born in the late 30th Century. Rokk Krinn was inspired by the heroics of Superman, to become a superhero himself and a member of the Legion. In 3009, Rokk traveled back in time to 2009, with Imra Ardeen and Garth Ranzz, to save the life of the young Clark Kent (the man who would one day become Superman). Rokk and the others managed to save Kent's life, while also helping him resolve another problem. Afterwards, Rokk and the others returned to the 31st Century. Close to three years later, Rokk helped resolving the war between Earth and New Krypton.

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Legion of Super-Heroes member
This character is or was a member of the Legion of Super-Heroes from the 30th/31st Century, in any one of their various continuities. Including but not limited to, Original Legion, the Reboot Legion, Prime Legion and the Post-Rebirth Legion.
This template will categorize articles that include it into the "Legion of Super-Heroes members" category.

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