Cosmic Boy, Rokk Krinn is a founding member of the Legion of Super-Heroes with the natural ability to manipulate magnetic fields.
On his native Braal, Rokk was a Magnoball champion, and a renowned athletic figure. After saving the life of billionaire industrialist R.J. Brande, along with two others Garth Ranzz and Imra Ardeen, he was invited to join the newly formed Legion of Super-Heroes, a team of superpowered teenagers representing the United Planets across the galaxy. After the brief and unsuccessful tenure of the government-appointed Leviathan, Cosmic Boy became the Legion's first long-term leader.
- 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 Ring: All Legionnaires were presented with a flight ring that enabled them to defy gravity and sustain movement through the air by aerodynamically generating force.
- Whereas the other Legionnaires more commonly receive their codenames upon entry to the Legion, Cosmic Boy is actually the nickname given Rokk from his days as a Magnoball champ.
- 168 Appearances of Rokk Krinn (Post-Zero Hour)
- 19 Images featuring Rokk Krinn (Post-Zero Hour)
- 5 Quotations by or about Rokk Krinn (Post-Zero Hour)
- Character Gallery: Rokk Krinn (Post-Zero Hour)
Legion of Super-Heroes member