Editing Cosmic Boy (section)

==Fictional character biography==
===Original===
{{Main article|Legion of Super-Heroes (1958 team)}}
Rokk Krinn, best known as Cosmic Boy, is a founding member of the [[Legion of Super-Heroes]], along with [[Garth Ranzz|Lightning Lad]] and [[Saturn Girl]] who possesses the innate ability to generate [[magnetic field]]s.<ref>{{cite book |last1=Fleisher |first1=Michael L. |title=The Original Encyclopedia of Comic Book Heroes, Volume Three: Superman |date=2007 |publisher=DC Comics |isbn=978-1-4012-1389-3 |pages=45–46}}</ref> Cosmic Boy's brother Pol joins the Legion as Magnetic Kid before being killed during the "Magic Wars".

In the pre-''[[Zero Hour: Crisis in Time!|Zero Hour]]'' Legion, Cosmic Boy is romantically involved with [[Night Girl]] (Lydda Jath), whom he eventually marries. During the [[Batch SW6|"Five Year Gap"]] following the Magic Wars, he loses his powers during a war between Braal and Imsk and leaves the Legion.

Rokk later returns to the Legion as '''Polestar''', using special gauntlets to recreate his old abilities.

===Post-Zero Hour===
{{Main article|Legion of Super-Heroes (1994 team)}}
In the post-Zero Hour Legion, Rokk Krinn came from a poor family but became a superstar in the Braallian sport of Magnoball, earning the nickname "Cosmic Boy" after winning the Magnoball Cosmic Games. After cutting ties with his corrupt manager, Alex Cuspin, Rokk joins the Legion of Super-Heroes as Cosmic Boy.<ref name="dc-ency"/>

Cosmic Boy later becomes the leader of the Legion before stepping down. He is among the Legionnaires sent to the 21st century by the [[Emerald Eye of Ekron]].

==="Threeboot" continuity===
{{Main article|Legion of Super-Heroes (2004 team)}}
[[File:Cosmic Boy LSH-9.jpg|thumb|upright|Part of the cover art for ''[[Legion of Super-Heroes]]'' vol. 5, #9 (October 2005), art by [[Barry Kitson]].]]
In ''Legion of Super-Heroes'' vol. 5, #1, Cosmic Boy is the leader of the Legion of Super-Heroes. After seemingly destroying the [[Dominators (DC Comics)|Dominators]]' homeworld (he actually sends it to the [[Phantom Zone]]), Cosmic Boy is voted out of office, being replaced by [[Supergirl (Kara Zor-El)|Supergirl]]. He then joins a superhero team from the 41st century, who come back in time to offer him membership.

===Post-Infinite Crisis===
Cosmic Boy is re-introduced following ''[[Infinite Crisis]]'', which restores an analogue of the pre-''[[Crisis on Infinite Earths]]'' Legion to continuity.

Comics writer [[Geoff Johns]] said about the characters:
{{cquote|Cosmic Boy is like the all-around leader who puts it all on his shoulders, but he's magnetic. His powers are all about magnetics, and so it carries over to his personality. And he struggles to bring all the Legion back together. He's like, 'We can do this. We can bring it together'. It comes naturally to him.<ref>{{Cite journal | last=Rogers | first=Vaneta | author2=Cliff Biggers | title=Their Name is Legion | journal=Comic Shop News | issue=1093}}</ref>}}

===Post-''Rebirth''===
In ''[[Doomsday Clock (comics)|Doomsday Clock]]'', Cosmic Boy is among the Legionnaires who appear in the present after [[Doctor Manhattan]] undoes his alterations to the timeline, restoring the Legion and the [[Justice Society of America]].<ref>''Doomsday Clock'' #12 (December 2019)</ref>

In ''[[The New Golden Age]]'', Cosmic Boy is among the Legion of Super-Heroes members who arrive in the present and confront the Justice Society over their decision to recruit Legionnaire, a young, heroic incarnation of [[Mordru]].<ref>''[[Justice Society of America]]'' (vol. 4) #10 (September 2024)</ref>