The essential episodes of What If...?

Watch these 15 in order and you've got What If...? — each pick states its reason.

  1. 01

    S01E01 · Pilot · August 11, 2021 · 36m

    What If... Captain Carter Were the First Avenger?6.8

    When Steve Rogers is seriously injured, Peggy Carter becomes the world’s first Super Soldier.

  2. 02

    S01E02 · Top rated · August 18, 2021 · 37m

    What If... T'Challa Became a Star-Lord?7.0

    The rough-and-tumble space pirates known as the Ravagers abduct T’Challa instead of Peter Quill.

  3. 03

    S01E03 · Top rated · August 25, 2021 · 35m

    What If... The World Lost Its Mightiest Heroes?6.9

    Nick Fury struggles to launch The Avengers when candidates are targeted by a serial killer.

  4. 04

    S01E04 · Season 1 peak · September 1, 2021 · 38m

    What If... Doctor Strange Lost His Heart Instead of His Hands?7.9

    A grief-stricken Doctor Strange uses the Eye of Agamotto in a dangerous effort to change the past.

  5. 05

    S01E05 · Top rated · September 8, 2021 · 34m

    What If... Zombies!?7.0

    When The Avengers are infected by a zombie plague, surviving heroes search for a cure.

  6. 06

    S01E08 · Top rated · September 29, 2021 · 32m

    What If... Ultron Won?7.8

    Natasha Romanoff and Clint Barton seek to destroy killer-robot Ultron following a cataclysmic event.

  7. 07

    S01E09 · Top rated · October 6, 2021 · 37m

    What If... The Watcher Broke His Oath?7.4

    The Watcher breaks his oath and recruits heroes from across the multiverse to battle against Ultron.

  8. 08

    S02E02 · Top rated · December 23, 2023 · 32m

    What If... Peter Quill Attacked Earth's Mightiest Heroes?6.4

    When Ego and a young Peter Quill threaten Earth in 1988, Howard Stark and Peggy Carter form a team.

  9. 09

    S02E04 · Top rated · December 25, 2023 · 34m

    What If... Iron Man Crashed Into the Grandmaster?6.6

    Tony Stark challenges The Grandmaster, leading to a grand prix-turned-demolition-derby death match.

  10. 10

    S02E05 · Top rated · December 26, 2023 · 33m

    What If... Captain Carter Fought the Hydra Stomper?6.5

    Captain Carter's mission to save Steve Rogers sets her on a collision course with new enemies.

  11. 11

    S02E07 · Season 2 peak · December 28, 2023 · 31m

    What If... Hela Found the Ten Rings?6.8

    Hela—stripped of her powers and banished to Earth—comes across a new source of power: the Ten Rings.

  12. 12

    S02E08 · Top rated · December 29, 2023 · 32m

    What If... The Avengers Assembled in 1602?6.7

    Captain Carter tries to undo the anomaly that strands familiar heroes and villains in the year 1602.

  13. 13

    S02E09 · Top rated · December 30, 2023 · 33m

    What If... Strange Supreme Intervened?6.6

    Captain Carter discovers the greatest threat to all existence may be closer than she realizes.

  14. 14

    S03E03 · Season 3 peak · December 24, 2024 · 33m

    What If... The Red Guardian Stopped the Winter Soldier?6.5

    It is 1991, and the Red Guardian takes it upon himself to join a high-profile mission and prove himself to his Red Room superiors. When his antics interfere with the Winter Soldier's own mission to kill Howard Stark, the two Soviet supersoldiers must form an alliance to escape the United States.

  15. 15

    S03E08 · Series finale · December 29, 2024 · 34m

    What If... What If? (2)5.6

    The end of the beginning...

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