A rumor that had been going around for the past week has come to fruition.
Rocket Racoon was one of the final remaining main characters in James Gunn's film that had not been cast. Reports surfaced earlier this week that Cooper was in talks for the role, but nothing had been confirmed until today.
The role will mark Cooper's first voiceover work as Rocket will be a CG character in the movie.
Guardians of the Galaxy will be Marvel's fourth film in its Phase Two series of films and is due in theaters August 1, 2014.
Are you intrigued to hear Cooper's voice as Rocket?