Robert Downey Jr. Tony Stark / Iron Man Chris Evans Steve Rogers / Captain America Mark Ruffalo Bruce Banner / Hulk Chris Hemsworth Thor Scarlett Johansson Natasha Romanoff / Black Widow Jeremy Renner Clint Barton / Hawkeye Don Cheadle James Rhodes / War Machine Paul Rudd Scott Lang / Ant-Man Benedict Cumberbatch Doctor Strange Chadwick Boseman T'Challa / Black Panther Brie Larson Carol Danvers / Captain Marvel Tom Holland Peter Parker / Spider-Man Karen Gillan Nebula Zoe Saldaña Gamora Evangeline Lilly Hope Van Dyne / Wasp Tessa Thompson Valkyrie Rene Russo Frigga Elizabeth Olsen Wanda Maximoff / Scarlet Witch Anthony Mackie Sam Wilson / Falcon Sebastian Stan Bucky Barnes / Winter Soldier Tom Hiddleston Loki Danai Gurira Okoye Benedict Wong Wong Pom Klementieff Mantis Dave Bautista Drax Letitia Wright Shuri John Slattery Howard Stark Tilda Swinton The Ancient One Jon Favreau Happy Hogan Hayley Atwell Peggy Carter Natalie Portman Jane Foster Marisa Tomei Aunt May Taika Waititi Korg (voice) Angela Bassett Ramonda Michael Douglas Hank Pym Michelle Pfeiffer Janet Van Dyne William Hurt Secretary of State Thaddeus Ross Cobie Smulders Maria Hill Sean Gunn On-Set Rocket / Kraglin Winston Duke M'Baku Linda Cardellini Laura Barton Maximiliano Hernández Agent Sitwell Frank Grillo Brock Rumlow 真田広之 Akihiko Tom Vaughan-Lawlor Ebony Maw James D'Arcy Jarvis Jacob Batalon Ned Vin Diesel Groot (voice) Bradley Cooper Rocket (voice) Gwyneth Paltrow Pepper Potts Robert Redford Alexander Pierce Josh Brolin Thanos Chris Pratt Peter Quill / Star-Lord Samuel L. Jackson Nick Fury Lexi Rabe Morgan Stark Ross Marquand Red Skull (Stonekeeper) Joe Russo Grieving Man Emma Fuhrmann Cassie Lang Michael James Shaw Corvus Glaive Terry Notary On-Set Groot / Cull Obsidian Kerry Condon Friday (voice) Ben Sakamoto Cooper Barton Ava Russo Lila Barton Cade Woodward Nathaniel Barton Stan Lee Driver Yvette Nicole Brown S.H.I.E.L.D. Agent Callan Mulvey Jack Rollins Lia Russo Lia Julian Russo Julian Taylor Patterson Taylor Agostino Rosalina Augie Ken Jeong Security Guard Ty Simpkins Harley Keener Jackson A. Dunn Scott Lang (12 Y.O.) Lee Moore Scott Lang (93 Y.O.) Matthew Berry S.H.I.E.L.D. Agent Joy McAvoy Asgardian Maiden John Michael Morris Young Hank Pym Michael A. Cook Male S.H.I.E.L.D. Agent Brent McGee Camp Lehigh Guard Brian Schaeffer Military Police Jamie Wedel Drill Sergeant Anthony G Breed Young Stan Lee Double Erica Ribley Car Girl Monique Ganderton On-Set Proxima Midnight Jim Starlin Support Group Man #1 Jimmy Ray Pickens Support Group Man #2 Hye Jin Jang Japanese Girl Russell Bobbitt Diner Owner Jack Champion Kid on Bike Sam Hargrave New Asgard Truck Driver Patrick Gorman Old Steve Rogers Double Aaron Lazar Doctor Strange Double Robert Pralgo Thanos Reader Tom Wisdom Loki Reader John Posey Alexander Pierce Reader Ameenah Kaplan Gamora Reader Olaniyan Thurmon Teenage Groot Reader Mike Lutz On Set Reader #2 Eric Patrick Cameron Midtown High Student (uncredited)