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) Don McLeod Statue Guy Daniel Bernhardt Gobot Flula Borg Bartender Rusty Schwimmer Sara Tinashe Kajese Officer Fitzgibbon Barry Curtis Officer R. Bobbitt Rachel Luttrell Upside-Down Cop Stephen Blackehart Steemie Sarah Alami Gloob Terence Rosemore Gurb Mark Hamill Drunken Knowherean (uncredited)