Movies Vin Diesel Can Say 'I Am Groot!' In Multiple Languages By Jackie Willis 9:52 AM PDT, July 31, 2014 Vin Diesel has one major line in Guardians of the Galaxy, and he had to learn it in A LOT of languages. The Fast & Furious star is the voice of Groot, and his character only says three words, "I am Groot." RELATED: Vin Diesel Covers Sam Smith!Diesel showed up on Wednesday's Tonight Show starring Jimmy Fallon and joked that the role was "very challenging" because he had to say those words in different, emotional ways. Another challenge, voicing his lines in multiple languages.Check out the 47-year-old saying "I am Groot" in English, French, Spanish, Russian, Brazilian/Portuguese and Mandarin ...in that order. Guardians of the Galaxy hits theaters Friday, Aug. 1.