I heard the rumor, but now it is official Vin Diesel will supply the voice of Groot from Guardians of the Galaxy. Now while there isn’t a lot of dialogue to learn ‘I am Groot’ is the only line the character says, he does say it with many different emotional inflections. I think the bass tone of Vin Diesel’s voice is a good match for the character. Taking on a smaller role, the star says, allows him to just give the audience what they want. Said Diesel, “That’s the thing — I’m so busy. The audience wanted Vin and Marvel, Vin and Marvel. But I’m too busy to do a six-month role. So what Marvel came up with was really interesting. … I am watching a social wave influence and in some ways guide their thinking.”
So… We know who is voicing Groot now… Leaving only fan favorite Rocket Raccoon to find his voice.