Sean Gunn is the brother of Guardians Of The Galaxy helmer James, but his small role in the movie as Yondu's right hand man Kraglin was more than just a family favour. He played a pivotal role during shooting by serving as the voice and performer of Rocket Raccoon, crawling around the set in a tight green spandex outfit as a reference point for the special effects team and as someone for the rest of the actors to bounce off during shooting.