Marvel’s first full Avengers: Doomsday trailer, released on July 20, 2026, shows Doctor Doom warning the heroes, Thor rallying a huge team, the X-Men’s mansion in ruins and Steve Rogers walking back in with Mjölnir. This breakdown sticks to what Gizmodo, Screen Rant and Kotaku each describe on screen, and it keeps their guesses in a separate section at the bottom. The film opens December 18, 2026 in the US and December 16 in the UK; the confirmed dates and cast are in our Avengers: Doomsday guide.
The video above is Marvel Entertainment’s official upload. If it does not play where you are, search for it on Marvel’s own YouTube channel.
The trailer, scene by scene
1. A damaged X-Mansion and a warning
The trailer opens at Xavier’s school. Gizmodo describes a battered sign reading “Xavier’s School for Gifted Youngsters” and Patrick Stewart’s Professor X shielding his eyes from a bright light in the sky; Kotaku calls it a tear in the sky and the mansion in disrepair. Robert Downey Jr.’s Doctor Doom then narrates, per Gizmodo, telling the heroes “Something’s coming” and, later, “Before this day is done, we shall be faced with an unthinkable decision.”
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2. Avengers Tower fills up
Gizmodo says an establishing shot of Avengers Tower is followed by Thor bringing the Fantastic Four inside to meet Anthony Mackie’s Sam Wilson as Captain America, Sebastian Stan’s Bucky Barnes and Paul Rudd’s Scott Lang. Screen Rant describes Thor speaking to the “New Avengers”, the Fantastic Four, Sam Wilson and Scott Lang, and says he admits the coming threats frighten him more than anything he has faced. Both outlets describe the heroes standing in groups, which Gizmodo lists as the Thunderbolts, the Fantastic Four and the original Avengers.
Screen Rant also reports monitors behind the heroes showing three worlds at risk of colliding. That fits Marvel’s official line that “beloved heroes from three distinct universes will be set on a deadly collision course,” quoted by Good Morning America.
3. Wakanda meets Talokan
Gizmodo, Screen Rant and Kotaku all describe Shuri and M’Baku with Wakandan warriors facing Namor on his throne in the undersea kingdom of Talokan. Gizmodo adds Bucky, Ghost, Falcon and Ben Grimm at the edge of the scene. Later, according to Gizmodo, M’Baku shakes hands with Ben Grimm, while Shuri, Sue Storm, Bucky, Falcon and Ghost look on.
4. Thor lands to face Doom
Gizmodo has Thor landing in a bolt of lightning on a battlefield of toppled statues, holding Stormbreaker, with Doom in the distance. Screen Rant says the remains of two Sentinels can be seen in the ruins behind him. Near the end, Gizmodo and Kotaku both describe Doom stopping Thor’s swing with two fingers, and Thor saying “We’re going to need a miracle.”
5. X-Men in action
The X-Mansion is destroyed in an explosion, per Gizmodo, and James Marsden’s Cyclops is seen scouting the area in a blue-and-yellow suit, according to Kotaku. All three outlets describe a fight between Channing Tatum’s Gambit and Simu Liu’s Shang-Chi, and Gizmodo and Kotaku both describe Florence Pugh’s Yelena Belova fighting Mystique, who shapeshifts into a copy of her. Gizmodo also describes Professor X and Ian McKellen’s Magneto clasping hands.
6. Loki, HERBIE and family moments
Tom Hiddleston’s Loki spins a TVA ID card. Screen Rant says the card has a picture of the multiversal tree on its back and that he is not wearing the crown or robes from his series finale. Gizmodo and Screen Rant both place the robot H.E.R.B.I.E. behind Yelena, next to Reed Richards and Sam Wilson. Gizmodo also describes Scott and Cassie Lang hugging and Johnny and Sue Storm embracing.
7. The final shot: Steve Rogers
The trailer ends with Chris Evans’ Steve Rogers walking in, saying “Hey, pal” and summoning Mjölnir, while Thor whispers “It’s not possible,” according to Gizmodo. Kotaku describes the same moment as Thor reuniting with the original Captain America.
What the trailer does not tell us
The outlets above are open about their guesses, and so are we. None of the following is confirmed by Marvel:
- Why heroes are fighting each other. Gizmodo asks why Gambit and Shang-Chi are fighting; Kotaku lists it as an open question too.
- Which three worlds collide. Screen Rant guesses the main MCU, the Fantastic Four’s world and the X-Men’s. Marvel’s line says only “three distinct universes.”
- How Steve Rogers is back. Gizmodo asks the question and the trailer does not answer it.
- Whether Doom starts as an ally. Screen Rant floats the idea. It is a theory.
Marvel has not announced a second full trailer, so this remains the main footage until it does.
Sources
- Gizmodo: What’s actually going on in the Avengers: Doomsday trailer (July 20, 2026)
- Screen Rant: Avengers: Doomsday trailer breakdown
- Kotaku: Things we noticed in Avengers: Doomsday’s first trailer (July 20, 2026)
- Good Morning America: trailer, release date and details
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