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Groot is one of the five main protagonists of Guardians of the Galaxy film series and one of the deuteragonists of Avengers: Infinity War and its currently untitled sequel. He is a humanoid tree that travels with the adventurer former mercenary Rocket Raccoon. Groot's ability to instantly grow in size and his incredible strength make him very useful to the much smaller Rocket during their adventures, and the two have grown to be inseperable best friends over the years. Eventually Groot, along with Rocket, join up with notorious outlaw Peter Quill, Drax the Destroyer and daughter of Thanos Gamora in order to protect the Galaxy from intergalactic threats.