- Primary Subject: Avengers: Doomsday
- Key Update: The official trailer reveals TVA-clad Loki investigating Steve Rogers' branched timeline, sparking theories of an early variant or multiversal mission.
- Status: Confirmed
- Last Verified: July 21, 2026
- Quick Answer: Loki returns in TVA gear to investigate Steve Rogers' timeline anomaly, hinting at a major multiversal mission before Doctor Doom's war begins.
Marvel Studios has officially released the highly anticipated trailer for Avengers: Doomsday, and among its biggest reveals is a Loki (Tom Hiddleston) twist that appears to support a major fan theory.
The two-minute-plus trailer features numerous MCU heroes alongside the X-Men. Given that Loki ended Loki Season 2 by taking his place at the center of the multiverse, holding together every branching timeline as its all-powerful protector, the new footage seemingly hints that fans have already figured out the God of Mischief's role in Doomsday.
What Is Loki’s Role in Avengers: Doomsday?
Loki returns in the Avengers: Doomsday trailer, but he no longer appears as the God of Stories wearing his majestic robes and towering horned crown from the Loki Season 2 finale.
Instead, he's seen wearing his familiar TVA uniform, raising questions about which version of the character appears in the film.
Since Loki ended Season 2 by becoming the guardian of the multiverse, his return in TVA attire suggests Marvel may be showing an earlier version of the character. His TVA badge, which features the Yggdrasil symbol, could also hint that this Loki exists before the creation of the multiversal tree.
Of course, Marvel Studios is known for editing its trailers to mislead audiences, so it's still too early to determine exactly which version of Loki will appear in Doomsday.
However, the setting shown in the trailer has sparked an intriguing fan theory. The bright curtains and interior closely resemble the house where Steve Rogers (Chris Evans) reunited with Peggy Carter (Hayley Atwell) at the end of Avengers: Endgame–the same location briefly seen in Steve's first Doomsday teaser.
One theory suggests that Loki is sent to investigate an anomaly created by Steve's decision to remain in the past with Peggy, which would have resulted in a branched timeline. Given Loki's experience managing branching timelines during his time with the TVA, he would be the best person to handle such a situation.
If Loki does meet Steve in Doomsday, it could support the theory that he didn't prune Steve's branch at all. Instead, he may have allowed it to exist or even helped preserve it, allowing Steve’s long-awaited return to the MCU.
Who Are the Marvel Heroes in Avengers: Doomsday Trailer?
The first Avengers: Doomsday trailer, which originally debuted at CinemaCon in April, brings together nearly every major MCU hero as they unite to face Doctor Doom (Robert Downey Jr.), the franchise's newest multiversal threat.
The footage shows Earth's Mightiest Heroes assembling as Doctor Doom prepares to unleash a war across the multiverse. Among the standout moments are Thor (Chris Hemsworth) taking on a towering version of Doom in battle and later reuniting with Steve Rogers, marking Chris Evans' long-awaited MCU return after Steve passed the Captain America mantle to Sam Wilson (Anthony Mackie) at the end of Avengers: Endgame.
The trailer also features several beloved X-Men from the Fox era, including Professor Xavier (Patrick Stewart), Magneto (Ian McKellen), Mystique (Rebecca Romijn), Cyclops (James Marsden), and Gambit (Channing Tatum).
Meanwhile, the Fantastic Four and the Thunderbolts join the fight to save the multiverse. One notable scene even shows Mystique transforming into Yelena Belova (Florence Pugh), hinting at the shapeshifter's role in the story.
Avengers: Doomsday is scheduled to hit theaters on December 18.
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