Robert Downey Jr. Tony Stark / Iron Man Chris Hemsworth Thor Odinson Mark Ruffalo Bruce Banner / Hulk Chris Evans Steve Rogers / Captain America Scarlett Johansson Natasha Romanoff / Black Widow Benedict Cumberbatch Stephen Strange / Doctor Strange Tom Holland Peter Parker / Spider-Man Chadwick Boseman T'Challa / Black Panther Don Cheadle James 'Rhodey' Rhodes / War Machine Zoe Saldana Gamora Karen Gillan Nebula Elizabeth Olsen Wanda Maximoff / Scarlet Witch Paul Bettany Vision Anthony Mackie Sam Wilson / Falcon Sebastian Stan James 'Bucky' Barnes / Winter Soldier Tom Hiddleston Loki Idris Elba Heimdall Danai Gurira Okoye Peter Dinklage Eitri the Dwarf Benedict Wong Wong Pom Klementieff Mantis Dave Bautista Drax the Destroyer Vin Diesel Groot (voice) Bradley Cooper Rocket (voice) Gwyneth Paltrow Virginia 'Pepper' Potts Benicio del Toro Taneleer Tivan / The Collector Josh Brolin Thanos Chris Pratt Peter Quill / Star-Lord Sean Gunn On-Set Rocket William Hurt Thaddeus 'Thunderbolt' Ross Letitia Wright Shuri Terry Notary Cull Obsidian / On-Set Groot Tom Vaughan-Lawlor Ebony Maw Carrie Coon Proxima Midnight (voice) Michael James Shaw Corvus Glaive Stan Lee Schoolbus Driver Winston Duke M'Baku Florence Kasumba Ayo Kerry Condon F.R.I.D.A.Y. (voice) Monique Ganderton On-Set Proxima Midnight Jacob Batalon Ned Leeds Tiffany Espensen Cindy Moon Isabella Amara Sally Avril Ethan Dizon Brian 'Tiny' McKeever Ariana Greenblatt Young Gamora Ameenah Kaplan Gamora's Mother Ross Marquand Johann Schmidt / Red Skull / Stonekeeper Stephen McFeely Secretary Ross' Aide Aaron Lazar Dr. Stephen Strange Double Robert Pralgo Thanos Reader Olaniyan Thurmon Teenage Groot Reader Blair Jasin Street Pedestrian #1 Matthew Zuk Street Pedestrian #2 Kenneth Branagh Asgardian Distress Call (voice) (uncredited) Samuel L. Jackson Nick Fury (uncredited) Cobie Smulders Maria Hill (uncredited) Harrison Osterfield Boy on Bus (uncredited) Marija Abney Dora Milaje (uncredited) Zola Williams Dora Milaje (uncredited) Marie Mouroum Dora Milaje (uncredited)