MARVEL COMICS: Marvel Cinematic Universe Bio Groot

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Groot is a big member of the Guardians of the Galaxy and the brute of the team.

MOVIE BIO:
Groot is a hyper-intelligent tree-like organism from the genus  Flora colossus. While he possesses great human level intellect, Groot's robust and heavyweight physiology causes the organs of his acoustic generation to become stiff and inflexible, rendering the limits of his speech to the phrase, "I am Groot."

COMIC BOOK BIO:
Groot is an alien known by the Kree as a Floral Colossus, though this species was once thought extinct. He was first seen when he landed on Earth and threatened humanity as one of the Marvel Monsters in the Marvel Age of Monsters. He was however soon defeated by a clever human which caused Groot to flee Earth once more. He was not heard from for many years after his initial encounter with humanity.

Some years later, Groot started changing his ways and became a force for the good. He joined a team of space superheroes, led by Peter Quill, AKA: Starlord. The group went to the planet known as Hala for an apparant suicide mission to stop a mass-assimilation weapon being developed by the Phalanx Covenant. During this mission, Groot is blown up and seemingly killed, though he is pleased to have this happen as he surveys the situation he's in and deems that it would be a good and honorable death. This is not to be, however, as part of Groot survives and catches up to the rest of his team. The twig-size Groot perches on Rocket Raccoon's shoulder for a time in a bit of turnabout as Groot's shoulder or outstretched hand had been Rocket's preferred gattling gun perch throughout the story up till then. Groot requests moisture and is spat upon by Rocket. Ignoble, but it helped.