Madeleine Kelders Peter Quill / Star-Lord Mark Heap Gamora Cassandra Cavalli Drax the Destroyer Darik Bernard Nebula Madeleine Kelders Peter Quill / Star-Lord Mark Heap Gamora Cassandra Cavalli Drax the Destroyer Darik Bernard Nebula Chris Pratt Mantis Jonathan Medina Groot (voice) Dave Bautista Rocket (voice) Yoon Jung-hoon Kraglin / Young Rocket Danielle Brooks The High Evolutionary Ruby McCollister Adam Warlock Philip Peeples Cosmo (voice) Marlene Tanczik Ayesha Alessandro Nivola Stakar Ogord Megan Sousa On-Set Groot / Phlektik Guard Lisa-Marie Koroll Steemie Blueliver Elizabeth Debicki Xlomo Smeth Stephen Blackehart Ssssaralami Kevin Olusola Recorder Theel Terence Rosemore Recorder Vim Bàrbara Mestanza Lylla Stacy Martin Teefs Isiah Thomas Floor Keegan-Michael Key War Pig (voice) Samantha Jones Mainframe (voice) Sarah Alami Martinex Miriam Shor Beardy Ravager Michael Rosenbaum Molly Ravager Elan Gale Fitz-Gibbonok Jason Mantzoukas Blurp (voice) Odelya Halevi Administrator Kwol Hank Azaria Master Karja Molly C. Quinn Bletelsnort Brad Abramenko Orgocorp Host Friniki Danny Huston Ura Gerardo Davila Gamora Shoots This Guy! Benjamin Byron Davis Carrot Head Guard Jonathan Mercedes Kitty Orgosentry Jonathan Fritschi Dancing Guard Max Bickelhaup Humanimal Kangaroo Kimberly Ann Parker Till Michaela Longden Gridlemop (voice) Dustin Demri-Burns Broker Pom Klementieff Bzermikitokolok Miho Suzuki Yondu Udonta Denise Morris Grandma Quill Julia Konrad Grandpa Quill Tommy Schlesser Crying Krylorian Citizen Seth MacFarlane Howard the Duck (voice) (uncredited) Becky G Phlektik (uncredited)