Origin of the Legion of Super-Heroes and Cosmic Boy is unknown, other than that he was the leader of the Legion, and that he founded it with Lightning Lad and Saturn Girl.

Dominator War

As the Wanderers have trapped most of the Legion in their headquarters with force-fields, Brainiac 5 decides to release Mon-El from the Phantom Zone, and manipulate him to fight Supergirl to shatter the force-fields, but without telling her. As far as Mon-El is released and begins fight with Kara, Cosmic Boy understands Brainy's plan. Brainy creates an antitoxin to Mon-El for Daxamite lead poisoning, and leaves it to the rest of the Legion to make Mon-El swallow it. Thanks to Atom Girl and Invisible Kid, Mon-El does, and comes to his senses, but is soon teleported of by the Wanderers. Cosmic Boy does later confront the Wanderers, who's leader turns out to be Mekt Ranzz, the brother of Lightning Lad (Garth Ranzz) and Light Lass (Ayla Ranzz). Mekt tells the Legion about the coming Dominator invasion, and Cos sends Brainy, Supergirl, Ultra Boy and Mon-El to Megatokyo, where the Dominators began with the invasion. The Dominators seem to have taken control of the Earth's technology in total, even the Legion's flight rings. After a failed rescue of some of Earth's residents, Cosmic Boy was captured by the Dominators. They tortured Cos to make him reveal the place of a rendezvous of the Legion and the Wanderers. He didn't say anything, but Triplicate Girl revealed it when they began to torture her. The Dominators did realise it was a trap, but that realisation was too late, since the Legion and the Wanderers had already gone trough the portal from Dominion to Earth, and begun a rampage on Dominion. After the final battle, the Legion and the Wanderers rested a little on a moon or a planet close to Dominion.
Cos had plans about sending Dominion to the Phantom Zone with a "bomb" that Brainy would build, and that had to be handcarried by Mon-El to the core of Dominion, but didn't know how to say that to the rest of the teams, with the thought of that Mekt Ranzz would probably try to retrieve Mon-El himself without any thought of retrieving something else too. Dream Boy solved that problem by telling them all that Cos planned to blow up Dominion with a bomb that Brainy was going to build. They discussed a while about who was going to deliver the bomb, but Cos decided that Mon-El was the one who was going to deliver it, since he would probably not survive anyway due to lead poisoning. Mon-El agreed, and delivered the "bomb". An election for the new Legion leader was held afterwards, and Supergirl won. However, before he could hear of the results, he had been contacted by the Knights Tempus (a crimefighting organization from the 41st century) and been asked to join them, and he accepted without telling anyone about it, leading to the Legionnaires next mission: finding him.


  • Braalian Physiology: Cosmic Boy is a Braalian, who have the natural ability to lift and manipulate metal. However, his knowledge and control over magnestism is much greater than the average Braalian. Cosmic Boy's magnetism can produce a number of astounding effects.
    • Magnetic Manipulation: He has the ability repel, attract, and manipulate metal objects of varying sizes, or anything containing metal, even on a microscopic scale. Naturally, the more metal there is in an object, the easier it is for him to affect it magnetically. Cosmic Boy has achieved the feat of pulling large iron meteors and satellites down from space to the surface of the Earth with minimal effort, as well. He once exerted "every bit" of his power to draw thousands of iron chunks upward into space.
    • Magnetic Force-Fields: Cosmic Boy can protect himself from physical harm, can stretch his fields to protect a large group, and can suspend persons or objects in the air using magnetic force fields. His force fields have also been able to withstand nuclear blasts.
    • Magnetic Flight: Cosmic Boy can suspend himself in flight by riding the Earth's magnetic field.
    • Electromagnetic Sight: By concentrating, Cosmic Boy can perceive the world around himself solely as patterns of magnetic and electrical energy. He can perceive the natural magnetic auras surrounding living beings, as well.
    • Magnetic Pulse: Cosmic Boy can focus his magnetic energy into immensely powerful concussive blasts. He can also overload or short-circuit electrical systems.
    • Energy Absorption: Cosmic Boy has been shown absorbing some forms of energy through his magnetic force fields to temporarily boost his own strengths. Early in his career with the Legion, he absorbed Lightning Lads's lightning blast.
    • Geomagnetic Link: Cosmic Boy is tied very closely to Earth's or what ever planet he is on EM Field. As is it effected, so is he. He knows instinctively all that happens to it.


  • Enhanced Intellect: Cosmic Boy is from the 30th Century, and as such his intellect is a level 9, compared to the average level 6 intellect of someone from the 21st Century.
  • Leadership: Cosmic Boy is a charismatic and effective leader, as seen during his successful tenure as the Legion's first leader.


  • Non-Metal Materials: Cosmic Boy's power cannot affect non-metals, such as organic substances like wood.




Legion Flight Rings
This character is exclusive to the continuity of the Supergirl and the Legion of Super-Heroes and 5th Legion of Super-Heroes series.

Any official designation for the home universe for this character has not been given, and thus this page may have to be moved in the future.
In the meantime, it's conjecturally designated as "New Earth".

Legion of Super-Heroes II 07
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Legion of Super-Heroes member
