Warning: Full spoilers follow for Marvel's What If…? Episodes 1-9.
The MCU-based What If…? animated series features many of the actual MCU actors from the movies voicing their iconic characters. At the same time, some actors aren't back to reprise their roles as part of the What If…? cast.
In the ninth and final episode of Season 1, What If…? tells the story of The Watcher assembling The Guardians of the Multiverse – Captain Carter, Thor, Killmonger, Star-Lord T’Challa, Gamora, and Doctor Strange/Strange Supreme – to stop Ultron and his plan to destroy the Multiverse as we know it.
Each episode features new and returning characters from the MCU, and we are here to document each one so you can keep track of which voice actors are returning to their roles, which aren't, and what these new versions of our favorite heroes look like. Read on for the full round-up of What If…? Season 1’s cast and characters!
Jump to a specific episode right here, or read through the slideshow or full article for every actor so far…
- What If…? Episode 9 Cast: What If… The Watcher Broke His Oath?
- What If…? Episode 8 Cast: What If… Ultron Won?
- What If…? Episode 7 Cast: What If… Thor Were an Only Child?
- What If…? Episode 6 Cast: What If… Killmonger Rescued Tony Stark?
- What If…? Episode 5 Cast: What If… Zombies!
- What If…? Episode 4 Cast: What If… Doctor Strange Lost His Heart Instead of His Hands?
- What If…? Episode 3 Cast: What If… The World Lost Its Mightiest Heroes?
- What If…? Episode 2 Cast: What If… T'Challa Became a Star-Lord?
- What If…? Episode 1 Cast: What If… Captain Carter Were The First Avenger?
What If…? Episode 9 Cast: What If… The Watcher Broke His Oath?
Gamora – Cynthia McWilliams
While Zoe Saldana did not voice Gamora in this week’s episode of Marvel’s What If…?, we did get a great performance by Cynthia McWilliams, who can be seen in Bosch, Coyote, and The Real Husbands of Hollywood.
Star-Lord T’Challa – Chadwick Boseman
While this finale may very well be Chadwick Boseman’s final appearance in a Marvel show or film, we are so thankful he was featured in as many episodes as he was in Marvel’s What If…?
The Watcher – Jeffrey Wright
As was foretold in the episode’s title – What If… The Watcher Broke His Oath? – The Watcher plays a big role in this episode and is the mastermind behind the plan to save the Multiverse. As always, Jeffrey Wright lends his voice to the character.
Nick Fury – Samuel L. Jackson
While he is only in this episode for a brief moment, Samuel L. Jackson once again voices Nick Fury and quickly notices that the Black Widow that saves him from Loki is not the one he knows. “You’re not my Natasha, but something tells me you have her spirit,” Fury says.
Peggy Carter / Captain Carter – Hayley Atwell
Hayley Atwell once again becomes Captain Carter to help lead the Guardians of the Multiverse. She even appears to have a happy ending as Steve Rogers may have survived thanks to the Hydra Stomper (and some possible help from The Watcher).
Natasha Romanoff / Black Widow – Lake Bell
In the season finale of Marvel’s What If…?, Lake Bell voices not one, but two versions of Natasha Romanoff. She even has the honor of firing the arrow that leads to the demise of Ultron.
Brock Rumlow – Frank Grillo
This episode features a few quick cameos from MCU characters, and Frank Grillo’s Brock Rumlow is one of them.
Batroc – Georges St-Pierre
The former mixed martial artist Georges St-Pierre steps back into the role of Batroc to try and take down Captain Carter. Unfortunately for him, or perhaps fortunately, The Watcher stops the fight before it’s over.
Peter Quill – Brian T. Delaney
Brian T. Delaney again replaces Chris Pratt as the version of Peter Quill who never became Star-Lord. Delaney is known, among other things, for his work as the male player character in Fallout 4.
Tony Stark / Iron Man – Mick Wingert
Mick Wingert may have struck gold by appearing yet again as Tony Stark / Iron Man in the place of Robert Downey Jr., but Stark himself wasn’t so lucky as he wasn’t chosen to become one of the Guardians of the Multiverse.
Killmonger – Michael B. Jordan
Michael B. Jordan once again takes on the role of Killmonger in this finale, and he ends up being one of the most important members of the Guardians of the Multiverse – before betraying them.
Shuri – Ozioma Akagha
Runaway’s Ozioma Akagha makes a brief return as Shuri in this episode of What If…? and, alongside Pepper Potts, attempts to stop Killmonger from causing more damage in Wakanda and beyond. Luckily, The Watcher takes care of that problem for them.
Thor – Chris Hemsworth
Thor’s party was cut short in Marvel’s What If…? by the invasion of Ultron and his minions. Even though this version of Thor can’t get enough of a good time, he was still chosen to become a member of the Guardians of the Multiverse. Even better? Chris Hemsworth returned to voice his iconic character.
Doctor Strange / Strange Supreme – Benedict Cumberbatch
Benedict Cumberbatch is once again the voice of Doctor Strange / Strange Supreme and his protections and magic are the key to stopping Ultron from destroying the Multiverse.
Ultron – Ross Marquand
The Walking Dead’s Ross Marquand returns again to voice an Ultron who is bent on using the Infinity Stones to destroy the Multiverse. Unfortunately for him, the Guardians of the Multiverse have other plans.
Arnim Zola – Toby Jones
Thanks to a perfect arrow strike from Black Widow, Toby Jones’ Arnim Zola… well, the computerized version of him… gets his chance to stop Ultron once and for all.
Loki – Tom Hiddleston
Tom Hiddleston makes another MCU appearance in this final episode of the first season of Marvel’s What If…?. While it’s another short one, it’s always great to see the return of the God of Mischief.
Ego – Kurt Russell
Kurt Russell once again voices Ego for a few lines in this episode before Star-Lord T’Challa saves Peter Quill from a horrible fate at Ego’s hand.
What If…? Episode 8 Cast: What If… Ultron Won?
The Watcher – Jeffrey Wright
While Jeffrey Wright’s The Watcher has appeared in every episode of What If…?, this is the first time he is involved in one of its events. When Ultron notices him and realizes there are an infinite amount of universes out there, he must do what he can to protect the many timelines.
Clint Barton / Hawkeye – Jeremy Renner
Jeremy Renner returns for another stint as Clint Barton/Hawkeye. In this story, he and Natasha appear to be among the only people left with the power to stop Ultron. While he is overwhelmed by the loss of his loved ones, he still finds the strength to help finish this most important mission with an ultimate sacrifice.
Doctor Strange / Strange Supreme – Benedict Cumberbatch
Benedict Cumberbatch’s Doctor Strange / Strange Supreme from Episode 4 makes his return. Presumably he will help The Watcher defeat Ultron and stop his mission of attacking other alternate universes in the season finale.
Natasha Romanoff / Black Widow – Lake Bell
Spider-Man: Into the Spider-Verse and Wet Hot American Summer: Ten Years Later’s Lake Bell once again takes on the role of Natasha Romanoff instead of Scarlett Johansson. Her character, alongside Hawkeye, is among the last of humanity who have any hope of stopping Ultron.
Arnim Zola – Toby Jones
Toby Jones once again becomes the voice of Arnim Zola in Marvel’s What If…?, and this time he plays the computerized version of himself not unlike what we saw in action in Captain America: The Winter Soldier. With a threat from Hawkeye and Black Widow, Zola agrees to help them stop Ultron by trying to destroy the robot from within.
Ultron / Sub-Ultron Sentries – Ross Marquand
James Spader did not come back for another round as Ultron, and instead, The Walking Dead’s Ross Marquand took up the role. Marquand already replaced Hugo Weaving as Red Skull in Avengers: Infinity War and Endgame, as well as on What If…?, and he has now added another character to his MCU resume in this episode.
Steve Rogers / Captain America – Josh Keaton
While President Steve Rogers only makes a brief appearance on a video screen in one of the many universes The Watcher and Ultron are jumping through in their battle, it is an enjoyable few seconds. Josh Keaton once again voices him instead of Chris Evans.
Tony Stark / Iron Man – Mick Wingert
Tony Stark only makes a brief appearance in this episode as one of the early victims of Ultron. Mick Wingert once again lends his voice to the iconic character instead of Robert Downey Jr.
Carol Danvers / Captain Marvel – Alexandra Daniels
We’ve seen the true power of Captain Marvel and it is something to behold. Unfortunately, it wasn’t quite enough to stop Ultron once he acquired the rest of the Infinity Stones from Thanos. Even though Brie Larson didn’t return, Alexandra Daniels returns to What If…? in the role for a great performance.
What If…? Episode 7 Cast: What If… Thor Were an Only Child?
Thor – Chris Hemsworth
Chris Hemsworth has once again become Thor, but this time we get to see what type of God of Thunder Thor would turn out to be had Loki not been by his side growing up. Turns out his partying across the galaxy has become as dangerous and legendary as Mjolnir itself.
Jane Foster – Natalie Portman
Despite only appearing in some reused footage for Avengers: Endgame, Natalie Portman is back as Jane Foster. While this may be an alternate universe take on Foster, Portman will also be returning for Thor: Love and Thunder where she will become the Mighty Thor.
Loki – Tom Hiddleston
While this episode may take a look at what Thor would be like had he not grown up with Loki as his brother, that doesn’t mean we don’t get any of the God of Mischief in it. In this story, Loki arrives as a full-blown Frost Giant who just wants to hang out with his “brother from another mother” Thor.
Darcy – Kat Dennings
Following her big role in WandaVision, Kat Dennings once again becomes Darcy to help out Jane Foster in this week’s episode of What If…? Unfortunately, it appears she will not be back for Thor: Love and Thunder.
Nick Fury – Samuel L. Jackson
Samuel L. Jackson plays just a small role in this week’s episode of What If…? as he gets knocked out by a running Korg. However, it’s always great to see him back as Nick Fury.
Grandmaster – Jeff Goldblum
Jeff Golblum returns to voice Grandmaster after making his debut in the MCU in Thor: Ragnarok. While he isn’t in the episode all that much, he can be seen having a wonderful time.
Maria Hill – Cobie Smulders
Cobie Smulders is back as the no-nonsense Maria Hill, and this time she is in charge of S.H.I.E.L.D. after Nick Fury was knocked out by Korg. She’s also the one who calls Captain Marvel to help stop the partying Thor.
Agent Coulson – Clark Gregg
Clark Gregg’s Agent Coulson appears once again this week and is becoming a regular for episodes of What If…?
Brock Rumlow – Frank Grillo
Frank Grillo returns to lend his voice to Brock Rumlow this week seemingly as a loyal S.H.I.E.L.D. soldier. It’s unclear if he will become the Hydra traitor we know in our MCU.
Korg – Taika Waititi
There’s no party without Korg, and Taika Waititi ensures the Korg we know and love in the MCU is part of Thor’s party on Earth. While he isn’t in the episode for long, he does play a big part as he knocks out Nick Fury.
Nebula – Karen Gillan
This episode of What If…? features many brief appearances by characters from the MCU, and Karen Gillan’s Nebula is one of them. In this story, she seems to love a bit of gambling.
Lady Sif – Jaimie Alexander
Jaimie Alexander returns to Lady Sif for another small part in Episode 7.
Howard the Duck – Seth Green
If there is a party, Howard the Duck won’t be far behind. Seth Green once again brought this wonderful duck to life with his voice.
Carol Danvers / Captain Marvel – Alexandra Daniels
While Alexandra Daniels made her What If…? debut as Captain Marvel at the end of Episode 3, she is one of the big players in this story after Maria Hill calls her in to stop Thor from destroying Earth. Daniels can also be seen in Mothers and Daughters and Salem.
Topaz – Rachel House
Topaz is seen eating cake alongside the Grandmaster, among doing other things, and Rachel House once again voices the bodyguard and head of the Sakaaran Guards.
Frigga – Josette Eales
Instead of Rene Russo, Covert Affairs and Blended’s Josette Eales takes up the role of Thor’s mother Frigga, who is just trying to enjoy some time with friends until Thor ruins her party by having his own.
Hogun – David Chen
David Chen, who is a voice actor for such games as Marvel’s Spider-Man and Ghost of Tsushima, replaced Tadanobu Asano in this episode as the voice of Hogun, one of Thor’s closest friends.
Volstagg and Drax – Fred Tatasciore
Prolific voice actor Fred Tatasciore lends his voice to both Volstagg and Drax this week, replacing Ray Stevenson and Dave Bautista, respectively. Tatasciore has another indirect connection with the MCU as he voiced Samuel L. Jackson in Team America: World Police.
Fandral – Max Mittelman
Instead of bringing back Josh Dallas or Zachary Levi, Marvel brought in Max Mittelman to play Thor’s friend Fandral. Mittelman is also the voice of Saitama in One Punch Man, Harry Osborne in the latest Spider-Man TV series, and Ryuji Sakamoto in Persona 5, among many other voice roles.
Surtur – Clancy Brown
When Thor parties, he brings ALL of his friends, including fire demon Surtur (who played a big role in Thor: Ragnarok). Clancy Brown once again voices the lord of Muspelheim… and befriends the Statue of Liberty.
The Watcher – Jeffrey Wright
As always, Jeffrey Wright returns as The Watcher to tell us this particular story of what would happen if Thor was an only child.
What If…? Episode 6 Cast: What If… Killmonger Rescued Tony Stark?
Tony Stark / Iron Man – Mick Wingert
Tony Stark’s life, and perhaps the entire Avengers initiative, was changed the most in this week’s story when Killmonger showed up to save him from the attack by the Ten Rings. Not only does he never become Iron Man, but he also falls to Killmonger after initially putting so much trust in him. Mick Wingert once again voices Tony Stark instead of Robert Downey Jr after making his first appearance in Episode 3.
Killmonger – Michael B. Jordan
Michael B. Jordan is back as Killmonger in this week’s episode and he lives up to the villain we were introduced to in Black Panther. In this alternate universe, however, he saves Tony Stark from the Ten Rings and becomes his trusted ally. Unbeknownst to many he encounters throughout this story, he has an ulterior motive with not only Tony – who he indirectly prevents from ever becoming Iron Man – but also with Ulysses Klaue, General Ross, and T’Chaka. Luckily, not everyone is fooled by his actions.
Happy Hogan – Jon Favreau
Jon Favreau returns to play a Happy Hogan who was passed up for his Stark Industries’ Chief Security Officer promotion when Tony Stark selected Lt. Eric Stevens/Killmonger for the job after his life was saved by him.
T’Challa / Black Panther – Chadwick Boseman
Chadwick Boseman once again takes up the role of T’Challa and Black Panther in this sixth episode, but he falls to Killmonger when trying to stop him from purchasing Vibranium from Ulysses Klaue.
Queen Ramonda – Angela Bassett
Angela Bassett lent her voice once again to Queen Ramonda, and we get to see her warrior side take center stage in the battle against the Liberators.
Okoye – Danai Gurira
As we seem to say every week, the wonderful Danai Gurira is back again as Okoye and she does what she does best – protect Wakanda and those who call it home.
Ulysses Klaue – Andy Serkis
Ulysses Klaue makes an appearance in this episode of Marvel’s What If…? and Andy Serkis returns to voice the arms dealer who meets a fate similar to the one he had in the MCU.
Rhodey – Don Cheadle
Since there is no Iron Man in this alternate timeline, that means there is also no War Machine/Iron Patriot. Despite that, James “Rhodey” Rhodes still has a role to play and Don Cheadle returns to voice him. Too bad he also has an unhappy ending thanks to Killmonger.
Jarvis – Paul Bettany
Paul Bettany is back as Tony Stark’s AI friend Jarvis, as this story takes place before he becomes Vision and is given physical form.
Christine Everhart – Leslie Bibb
Leslie Bibb makes her second appearance as Christine Everhart in Marvel’s What If…? and continues the trend of asking Tony Stark the tough questions.
T’Chaka – John Kani
John Kani is back as T’Chaka and puts his full trust in Killmonger after he “saves” Wakanda from an attack the villain secretly orchestrated. He even makes Killmonger the next Black Panther.
Obadiah Stane – Kiff Vandenheuvel
While Obidiah Stane returned for a new story in Marvel’s What If…?, Jeff Bridges did not. Instead, Kiff Vendenheuvel took on the role of Tony Stark’s business partner who was secretly plotting his demise. Vendenheuvel has appeared in Batman v Superman: Dawn of Justice as Officer Mazzuccheli, and in both Marvel’s Spider-Man and Spider-Man: Miles Morales for PS4/PS5.
Pepper Potts – Beth Hoyt
Gwyneth Paltrow did not return as Pepper Potts this week, and instead she is played by Better Call Saul and Brooklyn Nine-Nine’s Beth Hoyt. Pepper Potts ends up being one of the few people not swayed by Killmonger, and may be the key to stopping him in this alternate timeline.
General Ross – Mike McGill
Mike McGill once again replaces William Hurt to play General Ross, another character who unwittingly helps Killmonger achieve his goals.
Shuri – Ozioma Akagha
Shuri plays a big role in this week’s episode as one of the few characters who sees through Killmonger’s plan. Letitia Wright does not return to play the princess of Wakanda, and instead, she is voiced by Runaway’s Ozioma Akagha.
The Watcher – Jeffrey Wright
Jeffrey Wright is, as always, part of this episode of Marvel’s What If…?, and his character, The Watcher, gives us perhaps our best look at him so far.
What If…? Episode 5 Cast: What If… Zombies!
Bruce Banner / Hulk – Mark Ruffalo
Mark Ruffalo once again lends his voice to Bruce Banner and the Hulk, who has arrived on an alternate Earth to warn the Avengers of Thanos. However, the heroes he came to warn have turned into an even bigger threat than he could have ever imagined.
T’Challa / Black Panther – Chadwick Boseman
Chadwick Boseman makes his second appearance in Marvel’s What If…?, and this time he is playing the Black Panther we know and love… well, except for the fact that he was kidnapped by Vision and partially fed to a zombified Wanda Maximoff.
Vision – Paul Bettany
Paul Bettany’s Vision has had a rough go of it in not only in our Marvel Cinematic Universe, but in this one as well. While the zombie apocalypse may have prevented Thanos from killing him, his fate here is just as grim. He is powerless to help cure a zombie version of Wanda, and he has resorted to kidnapping his friends to keep her alive. Furthermore, he still is killed when the Mind Stone is removed from his head, yet this time it is by his own hand.
Bucky Barnes – Sebastian Stan
Sebastian Stan also makes a return to Marvel’s What If…?, this time with his long-flowing hair and Vibranium arm. In Peter Parker’s “So You Want to Survive the Zombie Apocalypse” video, he is not only known as Bucky “Silent But Deadly” Barnes, but his skills are listed as “murder, killer arm, and heavy sleeper.”
Hope van Dyne / Wasp – Evangeline Lilly
Evangeline Lilly takes on the role of Hope van Dyne once more, and is one of the people unintentionally involved in starting the MCU zombie apocalypse after Hank Pym found her mother Janet van Dyne who, in this universe, “contracted a quantum virus that corrupted her brain.”
Scott Lang / Ant-Man – Paul Rudd
Paul Rudd and his jokes find their way to Marvel’s What If…? this week, and while he returns as Ant-Man, most of his screen time is spent as a talking head that has been cured of the quantum virus that has turned this world into zombies. Does that make him Ant-Head now?
Happy Hogan / Zombie Happy – Jon Favreau
Happy Hogan is once again played by Jon Favreau, and although he gets a few moments to enjoy some Stark tech for himself, he soon thereafter becomes a victim of zombie Hawkeye.
In Peter Parker’s “So You Want to Survive the Zombie Apocalypse” video, he is not only known as Happy “Never Actually Happy” Hogan, but he’s also wearing a shirt that says, “I’m not single, I’m saving myself for Thor.” Also, his skills are listed as “driving, coffee, and boxing.”
Okoye – Danai Gurira
Danai Gurira lends her voice to Okoye once more this week after making an appearance in the second episode of What If…?
Sharon Carter – Emily Vancamp
Emily Vancamp is once again Sharon Carter in this week’s episode, and while she has a good run helping out the team, she, unfortunately, is attacked by zombie Captain America before being blown up from the inside by Hope.
In Peter Parker’s “So You Want to Survive the Zombie Apocalypse” video, she is known as Sharon “The Blond Bond” Carter and her skills are listed as “spycraft, first aid, and eulogies.”
Kurt – David Dastmalchian
David Dastmalchian is back as the “Resident Weirdo” Kurt and is one of the stars of Peter Parker’s “So You Wanna Survive The Zombie Apocalypse” video. His skills are listed as “languages, Slavic folklore, and crime.”
Peter Parker / Spider-Man – Hudson Thames
While Peter Parker is one of the main characters of this week’s episode, Tom Holland does not reprise his role as Spider-Man. Instead, Hudson Thames takes on the legendary role. Thames was previously seen in Mad Men, I think You Should Leave with Tim Robinson, and more.
Ebony Maw – Tom Vaughan-Lawlor
Tom Vaughan-Lawlor is once again Ebony Maw, but his arrival on Earth is short-lived after the zombie Avengers turn him into an undead nightmare as well.
Steve Rogers / Captain America – Josh Keaton
Josh Keaton, who voiced Steve Rogers in What If…?’s first episode, is back again for a short appearance as Captain America. The Avengers turning into zombies was one of the main reasons the full-blown apocalypse occurred, and Cap himself was undone by Hank Pym in tiny form.
The Watcher – Jeffrey Wright
Jeffrey Wright is once again The Watcher, but we get a brief look at his face, whereas before he was mostly a figure in the sky without an actual face. Could this evolution mean we are heading towards his role in future stories being expanded? Only time will tell.
Zombies
This week’s episode of Marvel’s What If…? was filled with zombified versions of our favorite heroes and villains, and while some of them had voice actors behind them, others just made an undead showing without words. These include Wanda Maximoff, Hawkeye, Iron Man, Doctor Strange, Wong, Cull Obsidian, and the Mad Titan himself – Thanos. Unfortunately, for this universe, Thanos still has the Infinity Gauntlet.
What If…? Episode 4 Cast: What If… Doctor Strange Lost His Heart Instead of His Hands?
Doctor Strange – Benedict Cumberbatch
Benedict Cumberbatch returned to play Dr. Stephen Strange M.D. — aka Sorcerer Supreme for Earth — in this twisted tale of obsession and regret.
Christine Palmer – Rachel McAdams
Rachel McAdams once again played Christine Palmer, Stephen Strange's love interest, marking her first return to the MCU since 2016's Doctor Strange. McAdams will be back as Christine again in 2022's Doctor Strange in the Multiverse of Madness.
The Ancient One – Tilda Swinton
Tilda Swinton reprised her role as The Ancient One, once again attempting to guide Doctor Strange through obstacles and temptation that could lead to ruin and cosmic devastation.
Wong – Benedict Wong
Benedict Wong was back as Doctor Strange's trusty Sanctum Sanctorum sidekick, Wong, though ultimately no one would be spared in Strange's dark and warped quest to reclaim the love of his life.
O'Bengh – Ike Amadi
A new character in the MCU, O'Bengh was the guardian of the Lost Library of Cagliostro. He eventually died of old age after Strange spent centuries learning forbidden knowledge and absorbing the energy of other magical beings.
In the comics, there is speculation that Cagliostro's real name was O'Bengh.
Christine Everhart – Leslie Bibb
Leslie Bibb can be heard briefly as reporter Christine Everhart, who appeared in both Iron Man and Iron Man 2 (as well as a viral videos released by Marvel preceding Ant-Man and Captain America: Civil War).
What If…? Episode 3 Cast: What If… The World Lost Its Mightiest Heroes?
Nick Fury – Samuel L. Jackson
Nick Fury takes center stage in the third episode of Marvel’s What If…?, and Samuel L. Jackson returns to voice the MCU character he’s been playing since 2008’s Iron Man. Unfortunately for this version of Nick Fury, his idea to form the Avengers didn’t go quite as planned.
Hank Pym / Yellow Jacket – Michael Douglas
Michael Douglas returns to play Hank Pym, but in this alternate universe he ends up becoming one of the episode’s true villains after his daughter Hope Van Dyne (Evangeline Lilly/The Wasp in the MCU!) passed away on a S.H.I.E.L.D. mission. Instead of becoming Ant-Man, he becomes Yellow Jacket, as he did in the comics.
Natasha Romanoff / Black Widow – Lake Bell
Scarlett Johansson, who is currently in a legal battle with Disney over a Black Widow contract breach, did not return to play Black Widow in this show. Instead, actress and comedian Lake Bell lent her voice to the iconic role. Bell and her voice have appeared in Spider-Man: Into the Spider-Verse, Wet Hot American Summer: Ten Years Later, the Harley Quinn TV series, Cryptozoo, and much more.
Tony Stark / Iron Man – Mick Wingert
Much like Black Widow, Iron Man also has a new voice actor as Robert Downey, Jr. did not return to play the character that kicked off the entire MCU. Instead, Mick Wingert took up the role. Wingert has played Tony Stark in a ton of Marvel shows, including Marvel Future Avengers, Spider-Man, Avengers Assemble, Guardians of the Galaxy, and more.
Agent Coulson – Clark Gregg
Clark Gregg once again becomes Agent Coulson in Marvel’s What If…? and is rightfully very impressed with Thor and his hair.
Brock Rumlow – Frank Grillo
Frank Grillo is back as Brock Rumlow and adds Marvel’s What If…? to the list of his MCU appearances that also include Avengers: Endgame, Captain America: Civil War, and Captain America: The Winter Soldier.
Clint Barton / Hawkeye – Jeremy Renner
Jeremy Renner, who already appeared in the first episode of Marvel’s What If…? alongside Samuel L. Jackson’s Nick Fury, returns for a bigger role in episode 3. Unfortunately, he doesn’t have quite a happy ending. Luckily, he will reprise the role once more in his own Disney+ show later this year.
Betty Ross – Stephanie Panisello
The role of Betty Ross has changed once more as Hulk’s Jennifer Connolly nor The Incredible Hulk’s Liv Tyler returned to reprise their role. Instead, Resident Evil: Infinite Darkness’ Stephanie Panisello makes her MCU debut in Marvel’s What If…?
Bruce Banner / Hulk – Mark Ruffalo
Bruce Banner and The Hulk make their Marvel’s What If…? debut in episode three. Although it’s always great to see Mark Ruffalo take on the role again, he returns for a story that sees an unfortunate end to his character.
Loki – Tom Hiddleston
Hot off the season finale of Marvel’s Loki, Tom Hiddleston appears again in the MCU as Loki in Marvel’s What If…? In this alternate universe, he comes to get his vengeance after the fall of Thor, and also takes the opportunity to become the ruler of Earth. Not bad for a day’s work.
General Ross – Mike McGill
Although William Hurt played General Thunderbolt Ross in Black Widow, Mike McGill was the one who voiced the short appearance by the general in this episode. McGill was recently seen in Bosch, Grace and Grit, Shameless, Grey’s Anatomy, and more.
Lady Sif – Jaimie Alexander
Much like Loki, Lady Sif returns to the MCU after making an appearance in Marvel’s Loki. Even better, Jaimie Alexander returns to lend her voice. Alexander is also set to be a part of Thor: Love and Thunder.
Carol Danvers / Captain Marvel – Alexandra Daniels
Although she is only seen for a brief moment at the very end, Captain Marvel answers Nick Fury’s call and heads to Earth to help her old friend. Instead of Brie Larson, Mothers and Daughters’ Alexandra Daniels plays the hero also known as Carol Danvers.
Thor
Thor and his majestic hair appeared in this episode of Marvel’s What If…?, but the God of Thunder had no lines, so there was no chance for Chris Hemsworth to return… yet.
What If…? Episode 2 Cast: What If… T'Challa Became a Star-Lord?
Star-Lord T'Challa – Chadwick Boseman
Before his death in 2020, Chadwick Boseman recorded his final lines for T’Challa for Marvel’s What If…?, but in this version he plays Star-Lord T’Challa instead of Black Panther. While he made his debut as this alternate version of his character in the second episode of the series, there are still more episodes with his character in them.
Nebula – Karen Gillan
Karen Gillan returns to voice Nebula, and this time she is sporting some flowing blonde hair and, thanks to T’Challa becoming Star-Lord and helping turn Thanos into a “good guy,” she is free to live another life that is not helping her adopted father balance the universe.
Yondu – Michael Rooker
Michael Rooker once again becomes Yondu in this episode of What If…? and sees first-hand what happens when he leaves important jobs to other people. Since his Ravagers picked up T’Challa instead of Peter Quill, the trajectory of his life has changed greatly as well.
Korath – Djimon Hounsou
In a hilarious twist to the beginning of Guardians of the Galaxy, Djimon Hounsou returns to play Korath, who is this time a huge fan of Star-Lord and ends up joining his team of Ravagers.
King T’Chaka – John Kani
The life of King T’Chaka is altered when his son goes missing one day, but that doesn’t stop him from searching the stars for T’Challa in the years that followed. John Kani returns as the voice of the king, and we get to see younger and older versions of him in the episode.
Thanos – Josh Brolin
In perhaps the most shocking twist of all, Josh Brolin returns to play a Thanos who has decided to give up on his idea of wiping out half of all living things in the universe. He has joined Star-Lord T’Challa and the Ravagers and, while he still jokes about his original plan being efficient, he has turned into a much more friendly Mad Titan.
The Collector – Benicio del Toro
Benicio del Toro once again plays The Collector, a character who has seen his stock rise after not having to deal with Thanos in his quest for the Infinity Stones. He is a force to be reckoned with in this alternate timeline, but ultimately is no match for T’Challa and his friends.
Ego – Kurt Russell
While it is but a brief cameo, Kurt Russell once again becomes Ego and decides to pay a visit to his son Peter Quill at a Dairy Queen. Quill of course never ended up becoming Star-Lord in this reality, though what this meeting with Ego means for him is unclear (for now).
Kraglin – Sean Gunn
Hot off his role as Weasel in James Gunn’s The Suicide Squad, the director’s brother Sean Gunn lends his voice once more to Kraglin.
Taserface – Chris Sullivan
Chris Sullivan is also back as the Ravager Taserface, joining Star Lord T’Challa and the rest of their crew across the stars.
Howard the Duck – Seth Green
Howard the Duck, who makes his fourth MCU appearance following the first two Guardians of the Galaxy films and Avengers: Endgame, is once again voiced by Seth Green and looking classy as ever.
Okoye – Danai Gurira
Danai Gurira has only one line, but it’s always a treat to hear and see Okoye – the general of the Dora Milaje – get more screen time.
Carina – Ophelia Lovibond
In this alternate story, Carina was never killed as she never tried to use the Power Stone against The Collector. What’s more, she gets some karmic justice against her captor.
Proxima Midnight – Carrie Coon
Carrie Coon once again plays Proxima Midnight, who joined forces with The Collector after Thanos had a change of heart.
Ebony Maw – Tom Vaughan-Lawlor
As with Proxima Midnight, Ebony Maw was on the look-out for new work following Thanos joining the Ravagers, and he joined The Collector just as the other members of the Black Order did.
Drax – Fred Tatasciore
Drax the Destroyer shows up in this episode of Marvel’s What If…?, but now he is… Drax the Bartender? While it’s great to see Drax again, he was voiced by Fred Tatasciore instead of Dave Bautista, who has said he was not asked to return to play his MCU character.
Corvus Glaive – Fred Tatasciore
Fred Tatasciore also plays Corvus Glaive from the Black Order, replacing the original voice actor Michael James Shaw.
Young T’Challa – Maddix Robinson
Young T’Challa only showed up in a deleted scene in Black Panther, but he gets a bigger role in Marvel’s What If…? In this episode, he was played by Maddix Robinson instead of Ashton Tyler.
Peter Quill – Brian T. Delaney
Peter Quill’s destiny was changed the most when the Ravagers picked up T’Challa instead of him. While we only see him for a brief moment, we see that his new fate was to work at Dairy Queen until his Dad pays him a visit. Chris Pratt did not return to voice this version of Peter Quill, and he was instead voiced by Brian T. Delaney.
Queen Ramonda, Shuri, and Cull Obsidian
Queen Ramonda of Wakanda, Shuri, and Cull Obsidian all make an appearance in this episode of Marvel’s What If…? but they have no lines so there were no returning or new actors for their characters.
What If…? Episode 1 Cast: What If… Captain Carter Were The First Avenger?
Captain Carter/Peggy Carter – Hayley Atwell
Hayley Atwell voices Peggy Carter in a story focusing on what would happen if she was the one who became a super soldier. Steve Rogers still joins the fight with a suit made by Howard Stark. Chris Evans did not return for this episode of What If…?, and instead Josh Keaton lent his voice to Skinny Steve Rogers.
Skinny Steve Rogers – Josh Keaton
Despite many of the other MCU characters returning to reprise their roles, Chris Evan did not return for What If…? to voice Skinny Steve Rogers. Instead, Josh Keaton became this alternate version of Steve. This voice actor is also known for his roles as Peter Parker in the animated The Spectacular Spider-Man series, Tony Stark in Marvel’s Iron Man VR, and many other projects.
Dr. Erskine – Stanley Tucci
Stanley Tucci voices Abraham Erskine, the only scientist to perfect the Super Soldier Serum. In this version of the story, he lives!
Howard Stark – Dominic Cooper
Dominic Cooper is back as (the younger version of) Howard Stark, who is the father of Iron Man himself, Tony Stark. In this story, Howard Stark created the first Iron Man armor in the Hydra Stomper.
Colonel Flynn – Bradley Whitford
While Bradley Whitford’s Colonel John Flynn has not been in a big MCU film, he was part of the Marvel One-Shot: Agent Carter, which was one of a series of shorts that expanded on the MCU world.
Johann Schmidt / Red Skull – Ross Marquand
Hugo Weaving did not return in What If…? to reprise his role as Red Skull, and instead Marvel brought back Ross Marquand, who played Red Skull in Avengers: Infinity War and Avengers: Endgame.
Dum Dum Dugan – Neal McDonough
Neal McDonough is back to voice Howling Commando Dum Dum Dugan from The Winter Soldier (and Agent Carter).
Bucky Barnes – Sebastian Stan
Sebastian Stan voices Bucky Barnes. In this alternate tale, Bucky was not experimented on by Arnim Zola and therefore never became The Winter Soldier.
Arnim Zola – Toby Jones
Toby Jones has returned to the MCU to voice Arnim Zola, and his fate is still very tied to Bucky Barnes, even if he isn’t as successful in this timeline.
Nick Fury – Samuel L. Jackson
Samuel L. Jackson returns to play Nick Fury and make a brief appearance at the end of the episode.
Hawkeye – Jeremy Renner
Jeremy Renner once again become Hawkeye in Marvel's What If…?
The Watcher – Jeffrey Wright
Jeffrey Wright plays The Watcher, a celestial being assigned to watch over Earth and its surrounding solar system. He'll serve as the narrator for the series each week.
For even more on the show, check out when What If…? episodes come out, get the lowdown on these nine crazy What If…? comics storylines, or catch up on how Chadwick Boseman's T'Challa becomes Star-Lord in the series.