Name: Cosmic Boy
Universe: Earth-1
Alter Ego: Rokk Krinn
Occupation: Legionnaire
Marital Status: Unmarried
Group Affiliation: Legion of Super-Heroes
Base of Operations: 30th Century Earth
Known Relatives: Pol Krinn (brother), Hu Krinn (father), Ewa Krinn (mother, deceased)
Height: 6 ft.
Weight: 190 lbs.
Hair Color: Black
Eye Color: Blue
First Appearance: Adventure Comics #247

History:
Rokk Krinn emigrated to Earth from the planet Braal, where he was brought up in the latter half of the 30th Century. Rokk had been born on Earth when his father worked there, and returned in search of a job utilizing his native Braalian control over magnetism.

As Rokk's ship arrived on Earth a fellow passenger named Imra Ardeen used her telepathic power to learn that assassins were about to strike at R.J. Brande, a wealthy man also traveling on the flight. Rokk's magnetic powers and the lightning powers of another passenger, Garth Ranzz, stopped the assassins.

Brande suggested that the three teenagers emulate legendary 20th Century heroes Superboy and Supergirl, and use their powers for good. They agreed and formed the Legion of Super-Heroes, and elected Rokk under his new name of Cosmic Boy as their first leader.

Serving as leader for the first two years, Cosmic Boy built the team to 18 members, and established its constitution and style. He still serves as an "elder statesman" on the LSH.

Recently Rokk's mother, Ewa, was killed in a fireballing incident, and his younger brother, Pol, was injured. This led Pol to take on the identity of Magnetic Lad and enter the LSH Academy.

Lydda Jath had a long-standing crush on Rokk, that has blossomed into a lasting romance.

Powers:
Rokk has the power to control magnetism, which he can use to attract, repel, or affect any magnetic atom or ore. This enables him to shatter metal or even to "fly" along the magnetic lines of force of certain planets, as well as to perform more simple feats such as tearing open metallic walls or repelling projectiles.

As a Legionnaire, Rokk has completed personal combat training but rarely uses his physical strength or prowess. He wears the LSH flight ring, which permits him to fly.