Disambiguation: Guardians of the Galaxy 2008+, Earth-616
First published in: 2007?
First appearance in Annihilation: Conquest - Starlord (Marvel, 2007 series) #1. Joined the Guardians of the Galaxy circa 2008. Not to be confused with Groot from Tales to Astonish (Marvel, 1959 series) #13, who is also a resident of Earth-616 and who this Groot sometimes impersonates.