Guardians of the Galaxy director James Gunn put to rest any remaining questions surrounding Vin Diesel's role by posting this picture of Diesel with the tree-like Groot on Facebook. Soon we'll find out how many ways Diesel can say, "I am Groot!"
It's not exactly a surprise that Diesel is voicing Groot (there is even footage of him walking around on tree stilts for his mo-cap performance), but it hasn't been officially announced until now. Gunn posted this image with the following text:
Yep it is completely official. AND he's amazing. I never knew someone could say I AM GROOT so many different ways and with such feeling (and that sounds like I'm kidding but I'm not!)
He also wrote:
Also I hope this puts to rest all the silly Thanos-Vin stuff which people just seemed to make up out of nothing.
Marvel also posted an announcement confirming Diesel's role.