<Li> Vin Diesel as voice of Groot: A member of the Guardians who is a tree - like humanoid . Executive producer James Gunn explained that Groot is still an adolescent in the film, in the same state of growth seen in one of the post-credit scenes in Guardians of the Galaxy Vol. 2 . Terry Notary provided motion capture for Groot, and said the character is "coming of age, so you'll see the teenager find a mentor to look up to and to model himself after". </Li> <Li> Bradley Cooper as voice of Rocket Raccoon: A member of the Guardians who is a genetically - engineered raccoon - based bounty hunter and mercenary, and is a master of weapons and battle tactics . Sean Gunn was again the stand - in for Rocket during filming, with his acting and expressions serving as motion reference for the character . </Li> <Li> Gwyneth Paltrow as Pepper Potts: Stark's fiancée and the CEO of Stark Industries . Downey felt that "Pepper remains the heart of the (Iron Man) story", which was not a focal point in some of the preceding films with Stark . Downey continued that "we wanted to get back to that reality . Not just for them, but let's really see how that can add to the something - worth - fighting - for of it all ." </Li> <Li> Benicio del Toro as Taneleer Tivan / The Collector: One of the Elders of the Universe, who is an obsessive keeper of the largest collection of interstellar fauna, relics, and species of all manner in the galaxy . </Li>

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