Mark Sinclair, professionally known as Vin Diesel, voiced Groot in Guardians of the Galaxy, Guardians of the Galaxy Vol. 2, Avengers: Infinity War, and Avengers: Endgame, and will reprise the role in Thor: Love and Thunder, The Guardians of the Galaxy Holiday Special, and Guardians of the Galaxy Vol. 3.
He was interviewed for the documentary Marvel Studios: Assembling a Universe.
- Together with Bradley Cooper, he was nominated for a MTV Movie Award for Best On-Screen Duo for his work on Guardians of the Galaxy.
- Vin Diesel's involvement with Marvel Studios began as just an internet prank he began by posting on Facebook that Marvel had "requested a meeting" with him. Eventually, Marvel Studios actually contacted him and he was cast as Groot.
- While recording for the voice of Groot, Vin Diesel was pleasantly surprised to be reunited with sound technician Doc Kane, whom he met while recording his role on The Iron Giant.
- Vin Diesel was linked to the role of Black Bolt for a long time when Inhumans was being developed as a feature film; however, James Gunn stated that Diesel was unlikely to play the role due to it becoming a television series instead.
- Vin Diesel previously worked with Nathan Fillion and Matt Damon in Saving Private Ryan.
- Vin Diesel previously worked with Dave Bautista in Riddick.
- Vin Diesel previously worked with Seth Green in Knockaround Guys.
- Vin Diesel previously worked with Kurt Russell in Furious 7 and The Fate of the Furious, and worked again with him in F9.
- Vin Diesel previously worked with Peter Dinklage in Find Me Guilty.
- Vin Diesel previously worked with Samuel L. Jackson in XXX and XXX: Return of Xander Cage.
- Vin Diesel previously worked with Michelle Yeoh in Babylon A.D. and will work with her again in Avatar 2.
- Vin Diesel previously worked with Robert Pralgo in Furious 7.
- Vin Diesel worked again with John C. Reilly and Stan Lee in Ralph Breaks the Internet.
- Vin Diesel worked again with John Brotherton and Djimon Hounsou in Furious 7.
- Vin Diesel worked again with Michael Rooker in F9.
- Vin Diesel will work again with Zoe Saldana in Avatar 2.
- Vin Diesel will work again with Russell Crowe in Ark: The Animated Series.
- Vin Diesel shares his birthday with Elsa Pataky.