Cosmic Boy

Cosmic Boy
Part of the cover art for Legion of Super-Heroes vol. 5, #9 (October 2005). Art by Barry Kitson.
Publication information
Publisher	DC Comics
First appearance	Adventure Comics #247 (April 1958)
Created by	Otto Binder Al Plastino
In-story information
Alter ego	Rokk Krinn
Species	Braalian
Place of origin	Braal
Team affiliations	Legion of Super-Heroes
Notable aliases	Polestar, Time Trapper
Abilities	Magnetism manipulation

Cosmic Boy
Cosmic Boy #1 (December 1986). Art by Steve Lightle.
Publication information
Publisher	DC Comics
Schedule	Monthly
Format	Miniseries
Publication date	December 1986 – March 1987
Number of issues	4
Main character(s)	Cosmic Boy Night Girl Time Trapper
Creative team
Writer(s)	Paul Levitz
Penciller(s)	Keith Giffen Ernie Colón Bob Smith
Editor(s)	Karen Berger

Cosmic Boy (Rokk Krinn) is a fictional character, a comic book superhero in the 30th and 31st centuries of the DC Comics Universe. He first appeared in Adventure Comics #247 (April 1958). He is a founding member of the Legion of Super-Heroes, and was the original leader in all incarnations of the Legion.

Cosmic Boy is a founding member of the Legion of Super-Heroes, along with Lightning Lad and Saturn Girl, and he has the superhuman ability to generate magnetic fields. Cosmic Boy's brother, Pol, eventually joined the Legion as Magnetic Kid, but died during the "Magic Wars". Cosmic Boy is one of the few Legionnaires ever to have his own miniseries, which ran for four issues in the mid-1980s as a spin-off of the Legends cross-over.

In the pre-Zero Hour Legion, Cosmic Boy was romantically involved with Night Girl (Lydda Jath) from the Legion of Substitute Heroes. During the "Five Year Gap" following the Magic Wars, he lost his powers in the course of a war between the planets of Braal and Imsk (the homeworld of Shrinking Violet), in which the Imskian army used a "dampener" on the magnetic fields within the Braalian soldiers. "Vi" was on the scene when her fellow Legionnaire was crippled by the dampener during the battle of Venado Bay, and harbored deep guilt for years. No longer using his codename, Rokk retired to the slums of a demilitarized Braal with his wife Lydda, who gave birth to their son Pol (named for Rokk's brother).