Josh Brolin Thanos (uncredited)
Chris Pratt Peter Quill
Nathan Fillion Monstrous Inmate
Vin Diesel Groot (voice)
Zoe Saldaña Gamora
Laura Haddock Meredith Quill
Karen Gillan Nebula
Stan Lee Executive Producer, Xandarian Ladies' Man, Thanks
Bradley Cooper Rocket (voice)
Dave Bautista Drax
Lee Pace Ronan
Benicio del Toro The Collector
James Gunn Writer, Maskless Sakaaran, Director
Emmett J. Scanlan Head Riot Guard
Djimon Hounsou Korath
Michael Rooker Yondu Udonta
Glenn Close Nova Prime
John C. Reilly Corpsman Dey
Ophelia Lovibond Carina
Ralph Ineson Ravager Pilot
Seth Green Howard the Duck (voice) (uncredited)
Sean Gunn Kraglin / On Set Rocket
Peter Serafinowicz Denarian Saal
Gregg Henry Grandpa
Arslan Elver Lead Animator
Kevin Feige Producer
Christopher Fairbank The Broker
Jack Kirby Thanks
Wyatt Oleff Young Quill
Mikaela Hoover Nova Prime's Assistant
Rob Zombie Ravager Navigator (voice)
Sharif Atkins Nova Arresting Pilot
Melia Kreiling Bereet
Simon Hayes Production Sound Mixer
Brendan Fehr Corpsman Dey's Partner
John Brotherton Nova Starblaster Pilot
Keeley Forsyth Mottled Prisoner
Tomas Arana Kree Ambassador
Clay Donahue Fontenot Stunts
Louis D'Esposito Executive Producer
Matthew Wood Sound Designer, Supervising Sound Editor
Enzo Cilenti Watchtower Guard
Jim Starlin Characters
Steve Englehart Characters
Monique Ganderton Stunt Double
Gene Colan Thanks
Marama Corlett Pit Boss
Andrew Simonin Hair Supervisor
Bruce Mackinnon One-Eyed Ravager
Andy Park Conceptual Illustrator
Don Heck Thanks
Marv Wolfman Thanks
Peter MacDonald Second Unit Director
Ronan Summers 'Drop the Leg' Guard
Tyler Bates Ravager Pilot (uncredited), Original Music Composer
Charles Wood Production Design
Alexis Denisof The Other
Sal Buscema Thanks
Sarah Halley Finn Casting
Nicole Alexandra Shipley Pretty Xandarian
Barbara Harris ADR Voice Casting
Rowley Irlam Stunt Coordinator
Bill Mantlo Characters
Alan Fine Executive Producer
Steve Gan Characters
David Smith Gaffer
Lloyd Kaufman Prisoner (uncredited)
Dave Jordan Music Supervisor
Elliot Hawkes Stunts
Lora Hirschberg Sound Re-Recording Mixer
Christopher Boyes Sound Re-Recording Mixer, Supervising Sound Editor, Sound Designer
Keith Giffen Characters