Chris Pratt Peter Quill / Star-Lord Zoe Saldaña Gamora Dave Bautista Drax the Destroyer Vin Diesel Groot (voice) Bradley Cooper Rocket (voice) Lee Pace Ronan the Accuser Michael Rooker Yondu Udonta Karen Gillan Nebula Djimon Hounsou Korath John C. Reilly Corpsman Dey Glenn Close Nova Prime Benicio del Toro Taneleer Tivan / The Collector Laura Haddock Meredith Quill Sean Gunn Kraglin / On Set Rocket Peter Serafinowicz Denarian Saal Christopher Fairbank The Broker Wyatt Oleff Young Quill Gregg Henry Grandpa Solomon Mousley Meredith's Brother Robert Firth Dr. Fitzgibbon Melia Kreiling Bereet Tom Proctor Horuz Nick Holmes Horuz' Mate Max Wrottesley Sacrificed Nova Corpsman Stan Lee Xandarian Ladies' Man Nicole Alexandra Shipley Pretty Xandarian Sharif Atkins Nova Arresting Pilot Stephen Blackehart Knowhere Dispatcher