We've got a few more cool behind the scenes photos for you to check out from the set of Guardians of the Galaxy. These feature pre-CGI versions of Groot, Rocket Raccoon and Chris Pratt sporting his Star-Lord helmet. What's cool about these is that they show you how Groot and Rocket were brought to life on the set of the film for the actors and crew to work with. It's always interesting to see how people work with animated characters that aren't really there. I was also informed that the stand in for Rocket Raccoon is Sean Gunn, who is director James Gunn's little brother.