Chris Pratt Peter Quill / Star-Lord Zoe Saldaña Gamora Bradley Cooper Rocket (voice) Dave Bautista Drax the Destroyer Karen Gillan Nebula Pom Klementieff Mantis Vin Diesel Groot (voice) Sean Gunn Kraglin / Young Rocket Chukwudi Iwuji The High Evolutionary Will Poulter Adam Warlock Maria Bakalova Cosmo (voice) Elizabeth Debicki Ayesha Sylvester Stallone Stakar Ogord Austin Freeman On-Set Groot / Phlektik Guard Stephen Blackehart Steemie Blueliver Terence Rosemore Xlomo Smeth Sarah Alami Ssssaralami Nico Santos Recorder Theel Miriam Shor Recorder Vim Linda Cardellini Lylla Asim Chaudhry Teefs Mikaela Hoover Floor Judy Greer War Pig (voice) Tara Strong Mainframe (voice) Michael Rosenbaum Martinex Elan Gale Beardy Ravager Molly C. Quinn Molly Ravager Gerardo Davila Fitz-Gibbonok Dee Bradley Baker Blurp (voice) Jennifer Holland Administrator Kwol Nathan Fillion Master Karja Benjamin Byron Davis Bletelsnort Tiffany Smith Orgocorp Host Friniki Daniela Melchior Ura Jonathan Mercedes Gamora Shoots This Guy! Jonathan Fritschi Carrot Head Guard Max Bickelhaup Kitty Orgosentry Brandon Morales Dancing Guard Tara Warren Humanimal Kangaroo Caleb Spillyards Humanimal Panda Bear Darla Delgado Neelie Ken Lyle Rabbit Businessman John William Wright Humanimal Hyena Randy Havens Till Dane DiLiegro Unsavory Octopus Kai Zen Phyla Adelynn Spoon Star Child Christopher Fairbank Broker Natalia Safran Controller Michael Rooker Yondu Udonta Gregg Henry Grandpa Quill Seth Green Howard the Duck (voice) (uncredited) Pete Davidson Phlektik (voice) (uncredited)