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What If...? · Season 1 · Episode 1

Captain Carter Were the First Avenger?

Carter doing her thing
Case File
Podcast Release
Sep 17, 2026
In-Universe
June 22, 1943 Confident
Reality
Era
Captain America Nexus
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Synopsis

June 1943. The Allies gather to make the first super soldier. Margaret Peggy Carter is asked whether she would be more comfortable watching from the booth. She says she would prefer to stay. That is the choice the universe splits off from. A Hydra saboteur, Heinz Kruger, opens fire in the lab before the procedure is able to start in earnest. Dr. Erskine is the first to be shot. Steve Rogers then takes a bullet. And, finally, Colonel Phillips is downed before Carter is able to deliver the killing shot to Kruger. Dr. Erskine's serum is locked and loaded, the power levels are dropping, and rather than lose the project Peggy climbs into the chamber herself despite Flynn's insistence otherwise. She comes out the world's first super soldier. Colonel Flynn calls it an absolute failure, tells her women do not fight on the front lines, and decides to put her behind a desk. Howard Stark disagrees. He hands her the USO costume she was supposed to sell war bonds in, rebuilt, with a shield.

Somehow knowing the location of the Tesseract, Peggy takes Hydra's convoy alone and delivers the cube to Flynn. Stark uses it to power an armored suit for Steve, whose wounds have left him unable to walk. Hydra starts calling him the Hydra Stomper. Peggy, Steve, Bucky Barnes, and The Howling Commandos fight the war as a unit. Then the faithful train job in the mountains goes wrong. The suit takes a hit and Steve falls, breaking Peggy's heart. The Red Skull retreats to Castle de Craque in the Black Forest and promises that a champion will be summoned from beyond the stars. Peggy and the Howling Commandos storm the Castle knowing the war may not end and they may not survive. What comes through the portal is enormous and consisting of massive tentacles. Ironically, it takes the Red Skull first. Steve arrives in the suit, having been found alive, freed by the Commandos, and running on borrowed power. Peggy shoves the creature back through the tear and gets pulled in with it. On the other side Nick Fury and Clint Barton stand amazed. She is told that the war ended nearly 70 years ago.

Reality Designation

This story takes place outside the main Marvel continuity: 82111

Did You Know?

Reality numbers are Marvel's official designations.

Where a universe has no official number we follow the Marvel Database and use its Temporary Reality Number (TRN-1092). Where there is neither — official or temporary — at the time we watch it, we assign a Snark Industries number of our own (SI-001).

Characters in the Episode

Peggy Carter
Peggy Carter Mantle: Captain Carter Played by: Hayley Atwell (Voice)

Milestone: Receives the Super Soldier Serum and becomes Captain Carter

Kills in this episode: 1

Takes the serum after Steve is shot; becomes this universe's first super soldier and its Captain

Howard Stark
Howard Stark Played by: Dominic Cooper (Voice)

Puts Peggy in the chamber, then builds her uniform and shield and Steve's suit

Steve Rogers
Steve Rogers Mantle: Hydra Stomper Played by: Josh Keaton (Voice)

Milestone: Misses his opportunity to receive the Super Soldier Serum but does receive the Hydra Stomper armor

Shot before the procedure and left unable to walk; pilots the Tesseract-powered armor Stark builds him

Dr. Abraham Erskine
Dr. Abraham Erskine Played by: Stanley Tucci (Voice)

Milestone: Killed by Heinz Kruger

Runs the procedure; killed in the lab attack

Johann Schmidt
Johann Schmidt Mantle: The Red Skull Played by: Ross Marquand (Voice)

Milestone: Killed by His Champion

Hunts the Tesseract, loses it, then summons a champion from beyond the stars and is killed by it

Uatu
Uatu Mantle: The Watcher Played by: Jeffrey Wright (Voice)

Narrates the branch point and closes on his oath not to interfere

Clint Barton
Clint Barton Mantle: Hawkeye Played by: Jeremy Renner (Voice)

Present at the modern-day portal recovery

Dr. Arnim Zola
Dr. Arnim Zola Played by: Toby Jones (Voice)

Hydra scientist moving the Tesseract, captured when Peggy takes the convoy

Heinz Kruger

Milestone: Killed by Peggy Carter

Kills in this episode: 2

Kills Erskine, Phillips, and shoots Steve after blowing up the lab.

Nick Fury
Nick Fury Mantle: Director of S.H.I.E.L.D. Played by: Samuel L. Jackson (Voice)

Present when Peggy comes back through the portal in the present day

Colonel Chester Phillips
Colonel Chester Phillips Mantle: Colonel of the United States Military

Milestone: Killed by Heinz Kruger

Present during Project Rebirth and Killed in the attack

Colonel John Flynn
Colonel John Flynn Mantle: Colonel of the Strategic Scientific Reserve Played by: Bradley Whitford (Voice)

Blocks Peggy from the field, dismisses the Tesseract as a glorified battery, and is overruled by results

Jim Morita
Jim Morita Played by: Non-speaking

One of Carter's Howling Commandos; Hand to Hand Specialty (Comic driven)

Gabe Jones

One of Steve's Howling Commandos; Translator

Comic Roots

Where the episode's people and places come from on the page.

Captain Carter Origin

The character was built for Marvel Puzzle Quest in 2016, part of a cross-game collaboration marking Captain America's seventy-fifth anniversary in which each Marvel game invented its own Captain America. She was popular enough that the comics adopted her, and she made her first comics appearance in Exiles (Vol. 3) #3 (May 2018) by Saladin Ahmed and Javier Rodríguez, with Álvaro López, Chris O'Halloran, and Joe Caramagna. That version, on Earth-86315, has Steve Rogers and Abraham Erskine both assassinated before the procedure and Howard Stark talking Peggy into taking the serum herself, and it gives her a companion of her own: Rebecca "Becky" Barnes, a young queer woman fighting beside her, a gender-flipped Bucky. Peggy Carter herself is much older than any of this. She debuts unnamed in Tales of Suspense #75 (March 1966) and is not named until #77 (May 1966), created by Stan Lee and Jack Kirby, and for decades she was a wartime memory rather than a lead.

The Costume and the Sword

Peggy is called Captain Carter by her friends, but the Union Jack across her chest points at a different hero. Captain Britain, Brian Braddock, was created by Chris Claremont and Herb Trimpe for Marvel UK and debuted in Captain Britain Weekly #1, cover-dated the week ending October 13, 1976. His origin is a choice: the sorcerer Merlyn offers candidates either the Amulet of Right or the Sword of Might. Peggy fighting with a sword in one hand and a shield in the other reaches for that pairing, and the joke lands on the source material, because Braddock refused the Sword and took the Amulet.

The Snark File

Easter eggs, callbacks and technical tidbits.

Flynn

Bradley Whitford is playing a character he originated eight years earlier. Colonel John Flynn never appeared in Captain America: The First Avenger; he was invented for the 2013 Marvel One-Shot: Agent Carter, where Whitford played him as Peggy's obstructive SSR boss. He is the only figure in this episode imported from a One-Shot rather than a feature, and he has been promoted to Colonel and moved back three years.

Voices

Almost every lead is voiced by the live-action performer. Steve Rogers and Johann Schmidt (kinda) are the exceptions. Josh Keaton voices Steve here and in his later appearances. Red Skull is voiced by Ross Marquand, who had already taken the role over from Hugo Weaving on the live-action side.

Shuma-Gorath

The tentacled thing is almost universally reported as Shuma-Gorath and almost certainly is not. Writer A.C. Bradley has said the creature was based on the Abilisk from Guardians of the Galaxy Vol. 2. The confusion is understandable: Nerdist noted the beast crawls out of the tear tentacle-first, which recreates Shuma-Gorath's entrance from Capcom's Marvel Super Heroes, and that the Hydra carving in the Norwegian church reads as the same one-eyed creature rather than the imagery Schmidt finds in the live-action film.

The Punching Bag

Peggy's scene with the punching bag being knocked off the chain is a clear referance to Steve doing the same in the After Credits scened in Captain America: The First Avenger