Cosmic Boy

Cosmic Boy

Real Name
Rokk Krinn
First Appearance
Adventure Comics #247 (April, 1958)
Otto Binder, Al Plastino
Team Affliations
The Legion of Super-Heroes
Polestar, The Time Trapper
Base of Operations
The Legion Clubhouse
Magnetism Control
Skills and Abilities
Experienced Leader
Tools and Weapons
Legion Flight Ring

Cosmic Boy (Rokk Krinn) is a fictional character in the DC Universe and a founding member/leader of the 30th century superhero team the Legion of Super-Heroes. Cosmic Boy is a hero with magnetic powers and he is an alien from the planet Braal, where all of the people have magnetic powers. As co-founder of Legion of Super-Heroes, he must often make hard decisions to protect his fellow teammates. Cosmic Boy lives in the 31st century, but once went back in time to recruit young Clark Kent before he became Superman


After using his alien powers, along with two other teenagers, to save a billionaire from assassins, the three teens are inspired to start a superhero team and becomes the magnetically powered Cosmic Boy.



Rokk Krinn was born to Ewa and Hu Krinn on the world of Braal and like all of his people, he was born with the ability to control magnetism. Braal is made entirely out of metal but suffered from poverty, which lead to Rokk leaving his home and parents at the age of 15 to go to Earth to find work and earn money for his family. During his journey to Earth, he and fellow passengers Irma Ardeen and Garth Ranzz used their unique superpowers to save R.J. Brande, a billionaire targeted by assassins. Brande was so impressed with the teenagers, he offered them money and resources to start a superhero team that would come to be known as the Legion of Super-Heroes. Krinn became the leader, taking the name Cosmic Boy.

The team started as a trio (with Saturn Girl and Lightning Lad) but the size of the team soon ballooned to 18 members. Believing that they owed a debt to the young superhero Superboy, the trio travelled back in time to induct him into their ranks (after an initiation prank where they used their power to make Superboy seem unworthy).


Cosmic is from the planet Braal and like every one from his world, he has the ability to control and manipulate magnetic forces. He can attract, repel, or manipulate any objects that have or contain metal. Cosmic Boy uses his Legion flight ring to fly during battle.

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