

Marvel animation · Series guide
What If...?
2021–2024 · 3 seasons · 26 episodes
Familiar heroes. Different choices. New worlds.
Explore the seasons- Series premiere
- August 11, 2021
- Viewing time
- 14h 25m (estimated)
- Viewing context
- Your route into the series ↗
The story
Why watch What If…?
What If…? uses animation to ask how familiar Marvel stories might change when a crucial choice goes another way. Jeffrey Wright voices the Watcher, the guide through these alternate worlds. Each premise gives returning characters a different situation to navigate, rather than replacing the events of their live-action films.
The appeal is in comparing a character with the circumstances around them. When a role changes hands or a familiar encounter goes differently, notice which qualities remain recognizable. The anthology format also lets you compare genres and visual approaches without expecting every episode to feel like the same kind of adventure.
Synopsis source · Disney ↗Before you begin
A starting point
Begin with season one's opening episode. Familiarity with Captain America: The First Avenger makes its changed premise easier to compare, but the link below is an optional reference rather than a new required-viewing rule.
Story & release
Where it fits
For a first viewing, follow the three seasons in release order. The episode titles below reveal each story's central question, so they can help you choose an outing to revisit. The official material on this page promotes the final season; save that trailer for later if you want to discover its characters and settings as you watch.
Your viewing time
Seasons & episodes
Episode times come from the existing catalog and remain labeled as estimates.
Season 1
9 episodes · 5h 23m (estimated)
Premiered August 11, 2021
The Watcher's first set of questions
The first season opens with Captain Carter and then moves between different alternate scenarios. Follow the listed order for a straightforward introduction to the Watcher's perspective. The episode names identify the starting questions; leave their answers to the stories rather than reading ahead through plot summaries.
Synopsis source · Marvel Studios ↗Optional before Doomsday. Animated alternate realities; its first episode's Captain Carter matters only if Doomsday's Peggy turns out to be her.
View 9 episodes
- 01What If... Captain Carter Were the First Avenger?36m (estimated)
- 02What If... T'Challa Became a Star-Lord?37m (estimated)
- 03What If... The World Lost Its Mightiest Heroes?35m (estimated)
- 04What If... Doctor Strange Lost His Heart Instead of His Hands?38m (estimated)
- 05What If... Zombies!?34m (estimated)
- 06What If... Killmonger Rescued Tony Stark?36m (estimated)
- 07What If... Thor Were an Only Child?38m (estimated)
- 08What If... Ultron Won?32m (estimated)
- 09What If... The Watcher Broke His Oath?37m (estimated)
Season 2
9 episodes · 4h 49m (estimated)
Premiered December 22, 2023
New encounters across the multiverse
The second season brings the Watcher back for another collection of altered Marvel situations. Its episode list includes Nebula, Captain Carter and Kahhori, giving you both returning points of reference and new names to discover. Continue after season one, and use the chapter titles below when returning to a particular scenario.
Synopsis source · Disney ↗Optional before Doomsday. More animated alternate realities with several Doomsday characters; fun, not required.
View 9 episodes
- 01What If... Nebula Joined the Nova Corps?31m (estimated)
- 02What If... Peter Quill Attacked Earth's Mightiest Heroes?32m (estimated)
- 03What If... Happy Hogan Saved Christmas?29m (estimated)
- 04What If... Iron Man Crashed Into the Grandmaster?34m (estimated)
- 05What If... Captain Carter Fought the Hydra Stomper?33m (estimated)
- 06What If... Kahhori Reshaped the World?34m (estimated)
- 07What If... Hela Found the Ten Rings?31m (estimated)
- 08What If... The Avengers Assembled in 1602?32m (estimated)
- 09What If... Strange Supreme Intervened?33m (estimated)
Season 3
8 episodes · 4h 13m (estimated)
Premiered December 22, 2024
The final journey
The third season closes the series with eight episodes and another mix of characters and genres. The Watcher remains your guide as the stories try different possibilities for familiar heroes. Watch after the first two seasons; the official trailer below offers a preview of this final collection rather than an introduction limited to season one.
Synopsis source · Disney ↗Optional before Doomsday. The final season of the animated multiverse anthology; fun, not required for Doomsday.
View 8 episodes
- 01What If... The Hulk Fought the Mech Avengers?31m (estimated)
- 02What If... Agatha Went to Hollywood?30m (estimated)
- 03What If... The Red Guardian Stopped the Winter Soldier?33m (estimated)
- 04What If... Howard the Duck Got Hitched?32m (estimated)
- 05What If... The Emergence Destroyed the Earth?33m (estimated)
- 06What If... 1872?32m (estimated)
- 07What If... The Watcher Disappeared? (1)28m (estimated)
- 08What If... What If? (2)34m (estimated)
People to follow
Characters & performers
Select a portrait to explore the character. Where a character guide is unavailable, the portrait opens the credited source page.
Marvel UK
Season 3 official trailer
Marvel UK’s trailer for the final season. Save it until after seasons one and two to avoid later footage.
Video loads only when selected. Watch on YouTube ↗
Explore further
Related titles
Explore Captain America: The First Avenger and Marvel Zombies. These are character or thematic browsing choices, not additional required viewing.
Sources & context
About this guide
Sources checked 2026-11-07. Catalog metadata, images and existing grades are from the current catalog. A source link does not imply streaming availability in your region.
- Disney — Series context ↗
- Marvel UK — Official season-three trailer ↗
- Disney — Season two premise ↗
- Marvel Studios — Season one production brief ↗


