Groot is part of the Guardians of The Galaxy. He was first seen in the movie 'Guardians of The Galaxy' with his companion Rocket the Racoon. At the end of the movie he sacrificed himself to save the members of the Guardians of The Galaxy, but since he was a tree, he was still able to be grown again and would be able to survive. He later was in 'Guardians Of The Galaxy VOL. 2' and then in 'Avenger: Infinity War' in which he dusted when Thanos snapped half the universe to death.