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Cosmic Boy (Rokk Krinn of the planet Braal) is a fictional character, a comic book superhero in the DC Comics universe. He has the superhuman ability to control electromagnetic fields. He is a founding member of the Legion of Super-Heroes, along with Lightning Lad and Saturn Girl. He first appeared in Adventure Comics #247 (April 1958).

Cosmic Boy's character has been fairly consistent over the various versions of the Legion. He was the Legion's original leader and is portrayed as such in the current version of the series. He is rather serious and has a strong sense of duty.

In the pre-Zero Hour Legion, he was romantically involved with Night Girl from the Legion of Substitute Heroes.

His original costume was pink with black at the sides, with four white circles , the code-name "Cosmic Boy" written on the chest, and a plastic bubble space helmet. After his first appearance, the helmet and the codename were replaced with white epaulets. For a period in the late 1970s, he was portrayed in a costume that was essentially a black bustier with black gloves and boots, with bare arms, shoulders, chest and legs. This costume—one of several designed by Mike Grell—received a mixed reaction from fans, some of whom felt it oversexualized Cosmic Boy, while others saw it as innovative and reflective of the times in which the comic was then being published. Cosmic Boy returned to a close variation on the original costume a few years later. In the post-Zero Hour Legion he wore a version of his original costume with lavender as the primary colour instead of pink. The current version is a similar pattern, with blue as the primary colour and black circles instead of white.

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.

Cosmic Boy appeared in the Amalgam Comics title Spider-Boy Team-Up. He was merged with Marvel character Vance Astro to form the character Vance Cosmic. He was a member of the Legion Of Galactic Guardians 2099.

Cosmic Boy appeared in an episode of the Superman animated series with Saturn Girl and Chameleon titled "New Kids in Town". He was voiced by Chad Lowe. He later reappeared in an episode of Justice League Unlimited titled "Far From Home".

Cosmic Boy will be a recurring member of the new animated series, Legion of Super-Heroes. He is voiced by Wil Wheaton.

• Cosmic Boy at the Big Comic Book DataBase