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The Marvel Cinematic Universe has grown into a massive universe, but there are a few franchises that have risen to the top as fan favorites. James Gunn’s Guardians of the Galaxy is certainly one of those, with each member of the motley crew becoming instantly popular upon their debut. But it turns out that prior to the 2014 original movie, one Marvel exec clashed with Gunn over Braley Cooper voicing Rocket Raccoon.