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Groot is a fictional character appearing in American comic books published by Marvel Comics. Created by Stan Lee, Larry Lieber and Jack Kirby, the character first appeared in Tales to Astonish #13. An extraterrestrial, sentient tree-like creature. The character was reintroduced as a heroic, noble being in 2006, and appeared in the crossover comic book storyline "Annihilation: Conquest". Groot went on to star in its spin-off series, Guardians of the Galaxy, joining the team of the same name.