Chris Pratt as Peter Quill / Star-Lord

Dave Bautista as Drax

Karen Gillan as Nebula

Pom Klementieff as Mantis

Vin Diesel as Groot (voice)

Bradley Cooper as Rocket (voice)

Sean Gunn as Kraglin

Rhett Miller as Bzermikitokolok

Murry Hammond as Alien Band (Kortolbookalia)

Ken Bethea as Alien Band (Sliyavastojoo)

Philip Peeples as Alien Band (Phloko)

Michael Rooker as Yondu

Kevin Bacon as Kevin Bacon

Luke Klein as Young Peter Quill

Maria Bakalova as Cosmo the Dog (voice)

Kyra Sedgwick as Kyra Sedgwick (voice)

Si Chen as Sobbing Woman

Don McLeod as Statue Guy

Thomas McNamara as 'Captain America'

Daniel Bernhardt as Gobot

Michelle Gunn as Tourist Mom

Flula Borg as Bartender

Matthew Withers as Handsome Man

Rusty Schwimmer as Sara

Helene D'Auria as Dispatcher (voice)

Tinashe Kajese as Officer Fitzgibbon

Barry Curtis as Officer R. Bobbitt

Rachel Luttrell as Upside-Down Cop

Giovannie Cruz as Orloni Peddler

Stephen Blackehart as Steemie

Sarah Alami as Gloob

Terence Rosemore as Gurb

Troy Beecham as Drunken Knowherean (uncredited)