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Cosmic Boy (DC)(Earth-0)
Real Name: Rokk Krinn
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Hailing from the planet Braal, Cosmic Boy (or "Cos", as he is more familiarly known) is one of the original Legion members to appear as "The Legion of Super-Heroes". He has absolute control over magnetism and shows often startling prowess at manipulating all things metallic in a way that casual comic fans might today recognize as a kind of riff on the X-Men villain, Magneto. In truth, though, this hero predates the Marvel villain by about a decade.

As one of the longest-running members of the Legion, and its frequent leader, his is one of the more developed personalities. Though his personality has fluctuated in each of the major runs of the book, he is characterized with some variation, but he never strays too far from being portrayed as an essentially serious leader--a "straight", earnest, mature figure amongst his more frivolous peers. He is frequently shown to be in an adversarial relationship with Braniac 5. He often displays fraternal respect to Lightning Lad/Live WIre and Saturn Girl. These four may be seen to be the solid leadership core of the group.

He has maintained various romantic relationships, but perhaps none as significant as that to the Legion of Substitute Superheroes' Night Lass.


First Appearance: Adventure Comics (1938) #247

Other Identities:
Rokk Krinn (DC)(Legion - 5 Years Later)

Favorite Characters:
Cosmic Boy (DC)(Earth-0) is a favorite character of 4 users

View a chronological listing of this character's appearances

Issue Appearances:
52 (2006)
80 Page Giant (1964)
Action Comics (1938)
Adventure Comics (1938)
Adventure Comics (2009)
Adventures of Superman (1987)
Adventures of Superman: José Luis García-López (2013)
All-New Collectors' Edition (1978)
Amazing World of DC Comics (1974)
Bizarro World (2005)
Books of Magic (1990)
Booster Gold (2007)
Cancelled Comic Cavalcade (1978)
Convergence (2015)
Cosmic Boy (1986)
Crisis on Infinite Earths (1985)
DC 100-Page Super Spectacular (1971)
DC Comics Classics Library (2009)
DC Comics Presents (1978)
DC Comics Presents: Legion of Super-Heroes (2011)
DC Retroactive: Flash - The '70s (2011)
DC Super Stars (1976)
DC Universe (2008)
DC Universe by Alan Moore (2012)
DC Universe: The Stories of Alan Moore (2006)
DC's Greatest Imaginary Stories (2005)
DC/WS DreamWar (2008)
DCU Holiday Special 2010 (2011)
DCU: Legacies (2010)
Elson's Presents Super Heroes Comics (1981)
Final Crisis: Legion of Three Worlds (2008)
Flashpoint: Kid Flash Lost (2011)
History of the DC Universe (1986)
Hourman (1999)
JSA Kingdom Come Special: Magog (2009)
Justice (2005)
Justice League Europe (1989)
Justice League of America (2006)
Karate Kid (1976)
Karate Kid (1977)
La Legion Des Super-Heros (1984)
La Legion des Super-Heros et les Nouveaux Jeunes Titans (1984)
Legends (1986)
Legion of Super-Heroes (1980)
Legion of Super-Heroes (1984)
Legion of Super-Heroes (1989)
Legion of Super-Heroes (2010)
Legion of Super-Heroes: 1,050 Years in the Future (2008)
Legionnaires (1993)
Legionnaires 3 (1986)
New Gods (1989)
Sarjakuvalehti (1985)
Secret Origins (1973)
Secret Origins (1986)
Secrets of the Legion of Super-Heroes (1981)
Star Trek/Legion of Super-Heroes (2011)
Superboy (1949)
Superboy and the Legion of Super-Heroes (1977)
Supergirl (2005)
Superman (1939)
Superman (1987)
Superman Extra (1980)
Superman the Origin of Superman [1966 Golden Record ed.] (1966)
Superman-Batman (1966)
Superman: Secret Origin (2009)
Superman's Girl Friend, Lois Lane (1958)
Superman's Pal Jimmy Olsen (1954)
Superman/Batman (2003)
Tales of the Legion (1984)
The Best of DC (1979)
The Brave and the Bold (1955)
The Brave and the Bold (2007)
The DC Comics Encyclopedia (2004)
The Fury of Firestorm (1982)
Timber Wolf (1992)
Who's Who in the DC Universe (1990)
Who's Who in the Legion of Super-Heroes (1988)
Who's Who: The Definitive Directory of the DC Universe (1985)
Who's Who: Update '87 (1987)
World's Finest Comics (1941)

Group Affiliation(s):
Legion of Substitute Heroes (DC)
Legion of Super-Heroes (DC)(Earth-0)

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