What If...? (TV) Cast
The cast of What If...?. Updated on September 11, 2025.
169 actors
Jeffrey Wright
as The Watcher (voice) (18 episodes)

Jeffrey Wright lends his voice to the character Uatu / The Watcher. Uatu is a powerful cosmic being who observes the events of different realities and remains a neutral observer.

Hayley Atwell
as Captain Carter (voice) (9 episodes)
Dominic Cooper
as Howard Stark (voice) (1 episode)

Dominic Cooper voices the character of Howard Stark. Howard Stark is a brilliant inventor and industrialist, known for his work in advanced technology and founding Stark Industries.

Stanley Tucci
as Dr. Erskine (voice) (2 episodes)

Stanley Tucci provides the voice for Dr. Abraham Erskine. Dr. Erskine is a German scientist who developed the Super Soldier Serum, which is used to transform Steve Rogers into Captain America.

Neal McDonough
as Dum Dum Dugan (voice) (1 episode)

Neal McDonough voices the character Timothy 'Dum Dum' Dugan. Dum Dum Dugan is a member of the Howling Commandos and a close ally of Captain America.

Darrell Hammond
as Nazi General (voice) (1 episode)

Darrell Hammond lends his voice to the character of the Nazi General. The Nazi General is a high-ranking officer in the Nazi army, opposing the forces of good in different realities.

Bradley Whitford
as Colonel Flynn (voice) (1 episode)

Bradley Whitford brings his voice to the character of Colonel Flynn. Colonel Flynn is a military officer with a significant role in the alternate reality presented in the show.

Andreas Beckett
as Additional Voices (voice) (1 episode)
David Cowgill
as Additional Voices (voice) (1 episode)
Matt Lindquist
as Additional Voices (voice) (1 episode)
Josh Brolin
as Thanos (voice) (2 episodes)
Carrie Coon
as Proxima Midnight (voice) (1 episode)
Djimon Hounsou
as Korath (voice) (1 episode)
Benicio del Toro
as The Collector (voice) (1 episode)
Sean Gunn
as Kraglin (voice) (1 episode)
Chris Sullivan
as Taserface (voice) (1 episode)
Ophelia Lovibond
as Carina (voice) (1 episode)
Maddix Robinson
as Young T'Challa (voice) (1 episode)
Tanya Wheelock
as Female Ravager (voice) (1 episode)
David Sobolov
as Additional Voices (voice) (1 episode)
Michael Woodley
as Additional Voices (voice) (1 episode)
Stephanie Panisello
as Betty Ross (voice) (1 episode)
Elisa Gabrielli
as Additional Voices (voice) (1 episode)
David Michie
as Additional Voices (voice) (1 episode)
Shane Sweet
as Additional Voices (voice) (2 episodes)
Rachel McAdams
as Christine Palmer (voice) (1 episode)
Benedict Wong
as Wong (voice) (1 episode)
Tilda Swinton
as The Ancient One (voice) (1 episode)
Ike Amadi
as O'Bengh (voice) (1 episode)
Evangeline Lilly
as Hope Van Dyne / Wasp (voice) (1 episode)
Paul Rudd
as Scott Lang / Ant-Man (voice) (2 episodes)
Emily VanCamp
as Sharon Carter (voice) (1 episode)
David Dastmalchian
as Kurt (voice) (1 episode)
Hudson Thames
as Peter Parker / Spider-Man (voice) (1 episode)
Paul Bettany
as Jarvis (voice) (1 episode)
Tom Vaughan-Lawlor
as Ebony Maw (voice) (2 episodes)
Ashley Adler
as Additional Voices (voice) (1 episode)
Matthew Yang King
as Additional Voices (voice) (1 episode)
Mike Vaughn
as Additional Voices (voice) (1 episode)
David Boat
as Additional Voices (voice) (2 episodes)
Sebastian Stan
as Bucky Barnes (voice) (4 episodes)
Angela Bassett
as Queen Ramonda (voice) (1 episode)
Danai Gurira
as Okoye (voice) (3 episodes)
Andy Serkis
as Ulysses Klaue (voice) (1 episode)
Leslie Bibb
as Reporter Christine Everhart (voice) (2 episodes)
Don Cheadle
as Rhodey (voice) (1 episode)
John Kani
as T'Chaka (voice) (2 episodes)
Kiff VandenHeuvel
as Obadiah Stane (voice) (1 episode)
Beth Hoyt
as Pepper Potts (voice) (1 episode)
Don Fullilove
as Additional Voices (voice) (2 episodes)
Khanya Mkhize
as Additional Voices (voice) (1 episode)
Debra Wilson
as Additional Voices (voice) (6 episodes)
Michael Patrick McGill
as General Ross (voice) (2 episodes)
Natalie Portman
as Jane Foster (voice) (1 episode)
Jeff Goldblum
as Grandmaster (voice) (2 episodes)
Cobie Smulders
as Maria Hill (voice) (2 episodes)
Clark Gregg
as Agent Coulson (voice) (2 episodes)
Taika Waititi
as Korg (voice) (3 episodes)
Karen Gillan
as Nebula (voice) (3 episodes)
Mark Ruffalo
as Bruce Banner / Hulk (voice) (3 episodes)
Chadwick Boseman
as Star Lord T'Challa (voice) (2 episodes)
Seth Green
as Howard the Duck (voice) (3 episodes)
Jaimie Alexander
as Lady Sif (voice) (2 episodes)
Rachel House
as Topaz (voice) (2 episodes)
Josette Eales
as Frigga (voice) (1 episode)
David Chen
as Hogun / Additional Voices (voice) (1 episode)
Isaac Robinson-Smith
as Brick (voice) (1 episode)

Isaac Robinson-Smith voices the character of Brick. Brick is a young and resourceful character who plays a role in the events of the series.

Michael Douglas
as Dr. Hank Pym / Ant-Man (voice) (1 episode)
Clancy Brown
as Surtur (voice) (3 episodes)
Michael Ralph
as Additional Voices (voice) (6 episodes)
June Christopher
as Additional Voices (voice) (3 episodes)
Kaitlyn Robrock
as Additional Voices (voice) (1 episode)
Michael Rooker
as Yondu (voice) (1 episode)

Michael Rooker brings his voice to the character of Yondu Udonta. Yondu is a Ravager and a somewhat reluctant mentor to Peter Quill (Star-Lord) in the Guardians of the Galaxy.

Jeremy Renner
as Clint Barton / Hawkeye (voice) (4 episodes)
Mick Wingert
as Tony Stark / Iron Man (voice) (6 episodes)
Piotr Michael
as Additional Voices (voice) (5 episodes)
Ross Marquand
as Ultron / Sub-Ultron Sentries (voice) (1 episode)
Alexandra Daniels
as Carol Danvers / Captain Marvel (voice) (3 episodes)
Dave B. Mitchell
as Additional Voices (voice) (4 episodes)
Fred Tatasciore
as Additional Voices (voice) (7 episodes)
Frank Grillo
as Brock Rumlow (voice) (4 episodes)
Shelby Young
as Additional Voices (voice) (4 episodes)
Ashley Peldon
as Additional Voices (voice) (2 episodes)
Georges St-Pierre
as Batroc (voice) (1 episode)
Tom Hiddleston
as Loki (voice) (4 episodes)
Toby Jones
as Arnim Zola (voice) (3 episodes)
Brian T. Delaney
as Peter Quill (voice) (2 episodes)
Michael B. Jordan
as Killmonger (voice) (2 episodes)
Cynthia Kaye McWilliams
as Gamora (voice) (2 episodes)
Benedict Cumberbatch
as Doctor Strange (voice) (3 episodes)
Chris Hemsworth
as Thor (voice) (4 episodes)
Ozioma Akagha
as Shuri (voice) (2 episodes)
Arthur Ortiz
as Additional Voices (voice) (4 episodes)
Helen Sadler
as Additional Voices (voice) (7 episodes)
Matthew Wood
as Additional Voices (voice) (15 episodes)
Jon Favreau
as Sir Harold 'The Happy' Hogan / Happy 'The Freak' Hogan (voice) (1 episode)
Chuck Billy
as Additional Voices (voice) (2 episodes)
Robin Atkin Downes
as Additional Voices (voice) (11 episodes)
Kari Wahlgren
as Additional Voices (voice) (3 episodes)
Kat Dennings
as Darcy Lewis (voice) (1 episode)
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