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Cosmic Boy ( Rokk Krinn) is a appearing in comics published by . He is from the 31st century, and is a founding member and original leader of the Legion of Super-Heroes.

Cosmic Boy has appeared in various media outside comics, primarily those featuring the Legion of Super-Heroes. He is voiced by in Legion of Super Heroes (2006) and portrayed by in .


Publication history
Cosmic Boy first appeared in #247 (April 1958) and was created by and .
(2025). 9781465453570, DK Publishing.


Fictional character biography

Original
Rokk Krinn, best known as Cosmic Boy, is a founding member of the Legion of Super-Heroes, along with and who possesses the innate ability to generate .
(2025). 9781401213893, DC Comics.
Cosmic Boy's brother Pol joins the Legion as Magnetic Kid before being killed during the Magic Wars.

In the pre- Legion, Cosmic Boy was romantically involved with (Lydda Jath). During the "Five Year Gap" following the Magic Wars, Rokk loses his powers after being exposed to a magnetic dampener during a war between Braal and Imsk (the homeworld of ). He leaves the Legion and returns to Braal to live there with Lydda. The two have a son named Pol, named for Rokk's brother.

When reforms the Legion, Rokk rejoins the group as Polestar, utilizing special gauntlets that replicate his original powers. However, he renounces the gauntlets after they began to affect his mind.

During the event, Rokk learns that he is apparently destined to become the . Shortly afterward, he and the rest of the Legion are erased from existence when the timeline is rebooted.


Post-Zero Hour
In post- Zero Hour continuity, Rokk Krinn is a celebrity player of the Braalian sport Magnoball, earning the nickname "Cosmic Boy" after winning the Magnoball Cosmic Games. He sends most of his earnings to his family, unaware that his manager Alex Cuspin is embezzling them. After learning of Cuspin's actions, Rokk dismisses him and has him arrested. , a veteran, appoints Cosmic Boy leader of the Legion following the death of . Cosmic Boy later voluntarily steps down from leadership, feeling that he has served as leader for long enough.


"Threeboot" continuity
In the fifth volume of Legion of Super-Heroes, Cosmic Boy is the leader of the Legion of Super-Heroes. After transporting the Dominators' homeworld to the , seemingly destroying it, Cosmic Boy is voted out of office and replaced by 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 , which restores an analogue of the pre- Crisis on Infinite Earths Legion to continuity.

Comics writer said about the character:


Post-Rebirth
In Doomsday Clock, Cosmic Boy is among the Legionnaires who appear in the present after undoes his alterations to the timeline, restoring the Legion and the Justice Society of America.

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 .


Limited series
Cosmic Boy was featured in a four-part limited series, cover dated December 1986 through March 1987. A tie-in to the Legends limited series, it was written by , with art by , Ernie Colón, and Bob Smith.

In the series, Cosmic Boy and Night Girl have traveled from the 30th century to enjoy a vacation in the 20th century. They find themselves threatened by many citizens and residents of the United States, who have been manipulated by as part of 's scheme to discredit Earth's superhero community. Soon after arriving, Cosmic Boy encounters , who does not recognize him despite Superboy being a member of the Legion for years. Cosmic Boy and Night Girl fear that something is terribly wrong with history. A space shuttle mission carrying a satellite crucial to Earth's future development of space travel goes awry, with the shuttle exploding. Cosmic Boy magnetically catches the payload and sends the debris harmlessly toward the ocean, but American soldiers assume that he is a foreign spy. They attack him, implementing 's directive that outlaws all superhero activity.

Seeking to protect the satellite, Cosmic Boy and Night Girl travel to facilities in where they meet Jason, one of the astronauts who designed the shuttle. They help to quell a riot that breaks out when demonstrators break down the gates at NASA, and Cosmic Boy becomes convinced that some unseen enemy is deliberately trying to prevent the mission. As they depart, the couple notes that both of their families are from worlds settled during the Great Emigration from Earth. They are unaware that the last name of Jason — the astronaut they just met — is Krinnski, which implies that he may be a distant ancestor of Cosmic Boy.

Cosmic Boy and Night Girl return to the 30th century, where time travel experts Brainiac 5 and Circadia Senius may be able to determine the problem. Upon entering the timestream, their Time Bubble encounters a storm and shakes violently. They are forced to return to the 20th century. They turn to Jason Krinnski for assistance, who does his best to help them repair the Time Bubble. However, their second attempt to leave fails, as if there was a barrier blocking them. Realizing that they need a massive power source to propel the Bubble to the 30th century, Cosmic Boy harnesses energy from Earth's magnetic field. They breach the barrier, but are propelled to the end of time, where they confront the .

The Trapper toys with the couple, giving them an hour to return to the 30th century. They eventually make their way through the Trapper's Citadel to their Time Bubble, just as the last grains in the hourglass are about to fall. Cosmic Boy uses his power to warp the hourglass, closing it so that the last grain will never fall. Amused, the Trapper allows them to leave. He directs the Time Bubble to the 30th century, placing it right in front of Legion Headquarters. He warns the couple that this will be their final journey through time, and that "the next occasion when a Legionnaire dares break the time barrier will be the last". As the two of them race to warn the Legion about what has occurred, the Trapper realizes that the Legionnaires will be returning for him.

The events of this series are continued in the 1987 story arc "The Greatest Hero of Them All".


Powers and abilities
Cosmic Boy possesses the innate ability to manipulate magnetism, being able to manipulate, repel, and attract metal objects of varying sizes. Naturally, the more metal is in an object the easier it is for him to affect magnetically. Cosmic Boy has been known to pull large iron meteors and satellites down from space with minimal effort. He can use his magnetic power on rocks that contain iron ore to pull or use them as projectiles. He can also magnetize metal objects so that they become magnets themselves and make them stick to other metal objects. His power cannot affect non-metals, such as organic substances like wood or flesh. His control is such that he can manipulate electronic records or the iron in blood. He has been known to use a uniform with ferrous fibres so he can fly with his own powers, but usually relies on a Legion flight ring.

As a member of the Legion of Super-Heroes, Cosmic Boy is provided a Legion Flight Ring. It allows him to fly and protects him from the vacuum of space and other dangerous environments.


In other media

Television
  • Cosmic Boy appears in the episode "New Kids in Town", voiced by . A green check mark indicates that a role has been confirmed using a screenshot (or collage of screenshots) of a title's list of voice actors and their respective characters found in its credits or other reliable sources of information.
  • Cosmic Boy makes a non-speaking cameo appearance in the Justice League Unlimited episode "Far From Home".
  • Cosmic Boy appears in Legion of Super Heroes (2006), voiced by . This version is often busy traveling the universe and maintaining the Legion's reputation, which strains his relationship with them, particularly Lightning Lad. As a result, temporarily replaces him as the Legion's leader after Lightning Lad calls for a new leader to be elected.
  • Cosmic Boy appears in , portrayed by . This version rarely speaks and displays the most determination of his teammates.


Film
  • Cosmic Boy appears in , voiced by . This version comes from a future Earth that Brainiac conquered by the year 2116.
  • Cosmic Boy appears in Legion of Super-Heroes (2023), voiced by Eric Lopez.
  • The Legion of Super Heroes (2006) incarnation of Cosmic Boy makes a non-speaking cameo appearance in Scooby-Doo! and Krypto, Too!.


Video games
  • Cosmic Boy appears as a character summon in .
  • Cosmic Boy makes a non-speaking cameo appearance in Brainiac's ending in Injustice 2.


Miscellaneous
  • Cosmic Boy appears in Adventures in the DC Universe #10.
  • Cosmic Boy appears in the one-shot comic Batman '66 Meets the Legion of Super-Heroes.


External links

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