Groot is the name of two fictional characters voiced by Vin Diesel and portrayed via motion capture by Diesel, Krystian Godlewski, Sean Gunn, James Gunn, and Terry Notary, in the Marvel Cinematic Universe (MCU) media franchise, based on the Marvel Comics character of the same name. Both Groots are depicted as tree-like humanoids, with the original being Rocket‘s associate, and the second becoming his adoptive son. Both are members of the Guardians of the Galaxy.
In March 2017, Gunn confirmed that the character Baby Groot introduced at the conclusion of Guardians of the Galaxy (2014) following the original Groot’s death and adopted by Rocket as his son is a different character from the first Groot, who does not have his biological father’s memories.[1][2]
As of 2021, the original Groot appeared in one film, the other in five and the animated series of shorts called I Am Groot (2022) released on Disney+. He will return in Guardians of the Galaxy Vol. 3 (2023) and The Guardians of the Galaxy Holiday Special (2022).