Chris Pratt Peter Quill / Star-Lord Dave Bautista Drax Karen Gillan Nebula Pom Klementieff Mantis Vin Diesel Groot (voice) Bradley Cooper Rocket (voice) Sean Gunn Kraglin Rhett Miller Bzermikitokolok Murry Hammond Alien Band (Kortolbookalia) Ken Bethea Alien Band (Sliyavastojoo) Philip Peeples Alien Band (Phloko) Michael Rooker Yondu (voice) Kevin Bacon Kevin Bacon Maria Bakalova Cosmo the Dog (voice) Kyra Sedgwick Kyra Sedgwick (voice) Flula Borg Bartender