Vin Diesel is Groot and now it appears as if Gregg Henry is joining the Marvel film as well.
The Scandal star tweeted out earlier, "OK UK hold on, I'm comin'. Joining @James Gunn again - #Slither #Super - this time for @Marvel #GuardiansOfTheGalaxy. Gonnabegreat!"
Outside of his very savvy twitter usage, the tweet doesn't give much information beyond that of Henry's involvement in the upcoming film. Most of the main characters have already been cast, outside of Rocket Raccoon.
Could Gregg Henry be Rocket Raccoon? We'll just have to wait and find out.