Editing Cosmic Boy (section)

{{Short description|Fictional DC Comics superhero}}
{{Infobox comics character
|image=Cosmic Boy (Post-Infinite Crisis version).jpg
|converted=y
|caption=Cover art for ''[[Final Crisis: Legion of Three Worlds]]'' #3 (February 2009), art by [[George Pérez]].
|alter_ego=Rokk Krinn
|publisher=[[DC Comics]]
|debut=''[[Adventure Comics]]'' #247 (April 1958)
|creators=[[Otto Binder]]<br>[[Al Plastino]]
|homeworld=[[List of DC Universe locations#Planets and moons which exist during the era of the Legion of Super-Heroes|Braal]]
|species=[[List of alien races in DC Comics#Braalians|Braalian]]
|alliances=[[Legion of Super-Heroes]]
|aliases=Polestar, [[List of DC Comics characters: T#Time Trapper|Time Trapper]]
|powers='''Powers:'''
*Magnetism manipulation
*Magnetic field / force manipulation
*Magnetic pulse
*Geomagnetic link
'''Abilities:'''
*Basic hand-to-hand combatant
*Enhanced intellect
*Gifted leader
'''Equipment:'''
*Legion flight ring
|cat=super
|subcat=DC Comics
|hero=y
|sortkey=Cosmic Boy
}}
'''Cosmic Boy''' ('''Rokk Krinn''') is a [[superhero]] appearing in comics published by [[DC Comics]]. He is from the 31st century, and is a founding member and original leader of the [[Legion of Super-Heroes]].<ref name="dc-ency">{{Citation | last=Greenberger | first=Robert | author-link=Robert Greenberger | contribution=Cosmic Boy | editor-last=Dougall | editor-first=Alastair | title=The DC Comics Encyclopedia | page=89 | publisher=[[Dorling Kindersley]] | location=New York | year=2008 | isbn=978-0-7566-4119-1 | oclc=213309017}}</ref>

Cosmic Boy has appeared in various media outside comics, primarily those featuring the Legion of Super-Heroes. He is voiced by [[Wil Wheaton]] in ''[[Legion of Super Heroes (TV series)|Legion of Super Heroes]]'' (2006) and portrayed by [[Ryan Kennedy]] in ''[[Smallville]]''.