Now we hear from James Gunn on the announcement via Twitter.
"Yes, it’s true, Bradley Cooper is Rocket and I couldn’t be more stoked," Gunn tweeted.
Bradley Cooper joins an all-star cast that includes Chris Pratt as Peter Quill Star-Lord, Dave Bautista as Drax The Destroyer, Zoe Saldana as Gamora, Benicio Del Toro as The Collector, Michael Rooker as Yondu, Karen Gillan as Nebula, Lee Pace as Ronan, Djimon Hounsu as Korath the Pursuer, with John C. Reilly as Rhomann Dey and Glen Close as Nova Prime.
Marvel and Gunn have yet to announce the voice of Rocket's buddy, Groot, with Vin Diesel said to be in talks for the role.
Get caught up on some of the recent news:
"Guardians of the Galaxy" has an August 1, 2014 release.">
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Guardians of the Galaxy, based on the Marvel comic books of the same name, features an unlikely cast of characters who must team up in order to defeat a cosmic force of epic proportions.