It has been long speculated and rumor that the Fast and Furious star, Vin Diesel, will be voicing Groot. It was confirmed by Marvel that he is indeed voicing Groot. This is another big time star that has joined the cast of Guardians of the Galaxy. Currently Bradley Cooper, Chris Pratt, Zoe Saldana, and Dave Bautista. Mainly the reason why this is a loaded cast is because not very many people know who the Guardians of the Galaxy are. Marvel is hoping with the name recognition, many casual fans would give it a shot. Also another big announcement was when Director James Gunn confirmed that Groot will only say ” I am Groot”. For those of you who do not know, Groot has conversations in his own language, and all anybody can hear is ” I am Groot”. That was a big question for many comic book fans and everybody should be relieve that Vin Diesel will stay true to the character and not say anything else. Thank the Lord.