Vin Diesel Groot (voice)
Zoe Saldaña Gamora
Chris Pratt Peter Quill
Josh Brolin Thanos (uncredited)
Nathan Fillion Monstrous Inmate
Benicio del Toro The Collector
Dave Bautista Drax
Bradley Cooper Rocket (voice)
Karen Gillan Nebula
John C. Reilly Corpsman Dey
Djimon Hounsou Korath
Glenn Close Nova Prime
Michael Rooker Yondu Udonta
James Gunn Writer, Maskless Sakaaran, Director
Lee Pace Ronan
Stan Lee Executive Producer, Xandarian Ladies' Man, Thanks
Peter Serafinowicz Denarian Saal
Luke Dunn Gielmuda Foley Editor
Ralph Ineson Ravager Pilot
Clay Donahue Fontenot Stunts
Seth Green Howard the Duck (voice) (uncredited)
William B. Kaplan Sound Mixer
Sarah Halley Finn Casting
Laura Haddock Meredith Quill
Reg Poerscout-Edgerton Local Casting
Thomas Robinson Harper Stunt Coordinator
Kevin Feige Producer
Melia Kreiling Bereet
Thomas A. Nelson Storyboard Artist
Emmett J. Scanlan Head Riot Guard
Gui DaSilva-Greene Stunts
Mens-Sana Tamakloe Stunts
Gregg Henry Grandpa
Tony Sereno Sound Re-Recording Assistant
Enzo Cilenti Watchtower Guard
Sean Gunn Kraglin / On Set Rocket
Elizabeth Yianni-Georgiou Makeup Designer, Hair Designer
Ophelia Lovibond Carina
Christopher Fairbank The Broker
Jane O'Kane Special Effects Makeup Artist
Jack Kirby Thanks
Wyatt Oleff Young Quill
Lloyd Kaufman Prisoner (uncredited)
Lebo "Boo" Motjuoadi Production Coordinator
Peter G. Travers Visual Effects Supervisor
Louis D'Esposito Executive Producer
Sharif Atkins Nova Arresting Pilot
Nicole Alexandra Shipley Pretty Xandarian
Rob Zombie Ravager Navigator (voice)
David R. Grant Stunt Double
Mikaela Hoover Nova Prime's Assistant
Tara Macken Stunt Double
Brendan Fehr Corpsman Dey's Partner
Don Heck Thanks
Jim Starlin Characters
Dave Jordan Music Supervisor
David J. Grant Co-Producer
Monique Ganderton Stunt Double
Chris Lyons Special Effects Makeup Artist
Matthew Wood Sound Designer, Supervising Sound Editor
Victoria Alonso Executive Producer
Zack Duhame Stunts
Keith Giffen Characters
Barbara Harris ADR Voice Casting
Marv Wolfman Thanks
Alexis Denisof The Other
Steve Englehart Characters
Nicholas Roche-Gordon Key Set Costumer
Doc Kane ADR Mixer
John Brotherton Nova Starblaster Pilot
Dennie Thorpe Foley Artist
Christopher Boyes Sound Re-Recording Mixer, Supervising Sound Editor, Sound Designer