Cosmic Boy
| Cosmic Boy | |
|---|---|
| Cover art for Final Crisis: Legion of 3 Worlds #3 (February 2009), art by George Pérez. | |
| Publication information | |
| Publisher | DC Comics | 
| First appearance | Adventure Comics #247 (April 1958) | 
| Created by | Otto Binder Al Plastino | 
| In-story information | |
| Alter ego | Rokk Krinn | 
| Species | Braalian | 
| Place of origin | Braal | 
| Team affiliations | Legion of Super-Heroes | 
| Notable aliases | Polestar Time Trapper | 
| Abilities | Powers: 
 Abilities: 
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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.
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 (2006) and portrayed by Ryan Kennedy in Smallville.