|Real name:||Rokk Krinn|
|Base:||30th century Metropolis|
|Affiliations:||Legion of Super-Heroes|
|Weaponry:||Legion Flight Ring|
|Voiced by:||Chad Lowe|
In 2979, Cosmic Boy, Saturn Girl, and Chameleon Boy traveled back in time to 20th century Smallville to prevent Brainiac from murdering a young Clark Kent so that he would never have become Superman. Years later, Cosmic Boy and the rest of the Legion of Super-Heroes were aided by Supergirl, Green Lantern, and Green Arrow in defeating their arch enemies, the Fatal Five.
Powers and abilities
Cosmic Boy had the ability to control and manipulate metallic objects for any of a number of purposes. He could magnetize metals to restrain, melt, explode, or reshape their physical properties.
- "Far From Home" (Cameo)
|Members of the Legion of Super-Heroes|
|Andromeda • Blok • Bouncing Boy • Brainiac 5 • Chameleon Boy • Colossal Boy • Cosmic Boy • Dream Girl • Kid Quantum • Light Lass • Lightning Lad • Phantom Girl • Saturn Girl • Shadow Lass • Supergirl • Timber Wolf • Triplicate Girl • Ultra Boy • Wildfire|