Subaru Kimura Peter Quill / Star-Lord Tomokazu Seki Gamora Yo Oizumi Drax Daiki Yamashita Nebula Masami Nagasawa Mantis Sudesh Berry Groot (voice) Kotono Mitsuishi Rocket (voice) Katsumi Toriumi Kraglin / Young Rocket (voice) Albert Brooks The High Evolutionary Ellen DeGeneres Adam Warlock Annaleigh Ashford Cosmo (voice) Ed O'Neill Ayesha Hayden Rolence Stakar Ogord Diane Keaton On-Set Groot / Phlektik Guard Eugene Levy Steemie Blueliver Ty Burrell Xlomo Smeth Kaitlin Olson Ssssaralami Idris Elba Hoobtoe Dominic West Orloni Peddler Kate McKinnon Recorder Theel Bill Hader Recorder Vim Andrew Stanton Lylla Alexander Gould Teefs Karan Ashar Administrator Kwol Sameer Hasan Master Karja Rukmini Vijayakumar Ura Shigeo Takahashi Broker Hisako Kanemoto Yondu Om Puri Grandma Quill Dwayne Johnson Capt. Charles 'Chuck' Baker (voice) Seann William Scott Skiff (voice) Jessica Biel Neera (voice) Justin Long Lem / Rover (voice) Gary Oldman General Grawl (voice) John Cleese Professor Kipple (voice) Alan Marriott Glar (voice) Mathew Horne Soldier Vesklin (voice) James Corden Soldier Vernkot (voice) Lewis Macleod Additional Voices (voice) Rupert Degas Additional Voices / Chief Gorlock (voice) Rebecca Front Additional Voices (voice) Vincent Marzello Additional Voices (voice) Emma Tate Additional Voices (voice) Pete Atkin Additional Voices (voice) Laurence Bouvard Additional Voices (voice) Brian Bowles Additional Voices (voice)