Vin Diesel Groot (voice)
Karen Gillan Nebula
Dave Bautista Drax
Josh Brolin Thanos (uncredited)
Nathan Fillion Monstrous Inmate
Zoe Saldaña Gamora
Chris Pratt Peter Quill
Benicio del Toro The Collector
Seth Green Howard the Duck (voice) (uncredited)
Bradley Cooper Rocket (voice)
Ralph Ineson Ravager Pilot
James Gunn Director, Writer, Maskless Sakaaran
Ene Frost Rifle Guard
Peter Serafinowicz Denarian Saal
Glenn Close Nova Prime
Djimon Hounsou Korath
Kim McGarrity Fight Choreographer
Stan Lee Xandarian Ladies' Man, Thanks, Executive Producer
Michael Rooker Yondu Udonta
Jack Kirby Thanks
Lee Pace Ronan
Mikaela Hoover Nova Prime's Assistant
Laura Haddock Meredith Quill
Tim Williams Additional Music, Orchestrator
Christopher Fairbank The Broker
Wyatt Oleff Young Quill
Jim Starlin Characters
John C. Reilly Corpsman Dey
Brendan Fehr Corpsman Dey's Partner
Ophelia Lovibond Carina
Leo Woodruff Stunts
Sean Gunn Kraglin / On Set Rocket
Sal Buscema Thanks
Louis D'Esposito Executive Producer
Stephen Urata Sound Re-Recording Assistant
John Brotherton Nova Starblaster Pilot
Kevin Feige Producer
Enzo Cilenti Watchtower Guard
Rob Zombie Ravager Navigator (voice)
Gregg Henry Grandpa
Monique Ganderton Stunt Double
Nicole Alexandra Shipley Pretty Xandarian
Douglas Robson Maskless Sakaaran, Stunt Double
Melia Kreiling Bereet
Sharif Atkins Nova Arresting Pilot
Keeley Forsyth Mottled Prisoner
David Hugghins Stunts
Steve Englehart Characters
Tomas Arana Kree Ambassador
Gene Colan Thanks
Barbara Harris ADR Voice Casting
Lloyd Kaufman Prisoner (uncredited)
Sarah Halley Finn Casting
Clay Donahue Fontenot Stunts
Emmett Scanlan Head Riot Guard
Matthew Wood Supervising Sound Editor, Sound Designer
Marama Corlett Pit Boss
David Yarovesky Goth Ravager
Spencer Wilding Mean Guard
Alexis Denisof The Other
David R. Grant Stunt Double
Don Heck Thanks
Nick Holmes Horuz' Mate
Peter MacDonald Second Unit Director
Zack Duhame Stunts
Ronan Summers 'Drop the Leg' Guard
Naomi Ryan Nova Centurion
Kyrsten Mate Sound Effects Editor
Rowley Irlam Stunt Coordinator
Christopher Boyes Supervising Sound Editor, Sound Re-Recording Mixer, Sound Designer
Gui DaSilva-Greene Stunts
Marv Wolfman Thanks