Vin Diesel Groot (voice)
Chris Pratt Peter Quill
Bradley Cooper Rocket (voice)
Josh Brolin Thanos (uncredited)
Nathan Fillion Monstrous Inmate
Zoe Saldaña Gamora
Dave Bautista Drax
James Gunn Writer, Maskless Sakaaran, Director
Benicio del Toro The Collector
Karen Gillan Nebula
Lee Pace Ronan
Djimon Hounsou Korath
Michael Rooker Yondu Udonta
Stan Lee Executive Producer, Xandarian Ladies' Man, Thanks
Seth Green Howard the Duck (voice) (uncredited)
Glenn Close Nova Prime
Peter Serafinowicz Denarian Saal
Kevin Feige Producer
Ralph Ineson Ravager Pilot
Emmett J. Scanlan Head Riot Guard
Gregg Henry Grandpa
Laura Haddock Meredith Quill
John C. Reilly Corpsman Dey
Mikaela Hoover Nova Prime's Assistant
Enzo Cilenti Watchtower Guard
Ophelia Lovibond Carina
Wyatt Oleff Young Quill
Louis D'Esposito Executive Producer
Sharif Atkins Nova Arresting Pilot
Brendan Fehr Corpsman Dey's Partner
Sean Gunn Kraglin / On Set Rocket
Christopher Fairbank The Broker
Rob Zombie Ravager Navigator (voice)
Jack Kirby Thanks
Monique Ganderton Stunt Double
Matthew Wood Sound Designer, Supervising Sound Editor
Zack Duhame Stunts
Lloyd Kaufman Prisoner (uncredited)
John Brotherton Nova Starblaster Pilot
Alexis Denisof The Other
Jim Starlin Characters
Melia Kreiling Bereet
Christopher Boyes Sound Re-Recording Mixer, Supervising Sound Editor, Sound Designer
Tomas Arana Kree Ambassador
Don Heck Thanks
Annabel Wood Stunts
Sarah Halley Finn Casting
Marama Corlett Pit Boss
Barbara Harris ADR Voice Casting
Steve Englehart Characters
Keeley Forsyth Mottled Prisoner
Spencer Wilding Mean Guard
Peter MacDonald Second Unit Director
Graham Shiels Alien Nova Pilot
Tara Macken Stunt Double
Nicole Alexandra Shipley Pretty Xandarian
Marv Wolfman Thanks
Richard Roberts Set Decoration
Gene Colan Thanks
Steve Gan Characters
Lora Hirschberg Sound Re-Recording Mixer
Chris Lyons Special Effects Makeup Artist
Keith Giffen Characters
Cali Nelle Stunts
Bruce Mackinnon One-Eyed Ravager
Alexandra Byrne Costume Design
William B. Kaplan Sound Mixer
James Wright Dolby Consultant
Julian Morson "B" Camera Operator
Charles Wood Production Design
James Young Fight Choreographer
Dominic Preece Stunts