Guest Stars Karen Gillan as Nebula Michael Rooker as Yondu Sean Gunn as Kraglin Obfonteri Chris Pratt as Peter Quill / Star-Lord Bradley Cooper voices Rocket Kevin Bacon as Himself Vin Diesel voices Groot Dave Bautista as Drax the Destroyer Pom Klementieff as Mantis Maria Bakalova voices Cosmo the Spacedog
