Doom Brought Sentinels to Hall H: Inside the Avengers: Doomsday Footage Comic-Con Just Lost Its Mind Over

The Avengers: Doomsday Comic-Con footage did the one thing eighteen months of casting announcements could not: it made the film feel like a story rather than a headcount. Marvel closed its Hall H panel with an extended reel for Avengers: Doomsday, and the reveal that emptied the room's lungs was not a cameo. It was an army of Sentinels — the mutant-hunting machines from the X-Men films — marching under Doctor Doom.

One caveat before we go further, because it matters for everything below. The reel was exclusive to Hall H. Marvel has not put it online, so every description in circulation — ours included — is reconstructed from attendee accounts and trade reports written in the dark on a phone. The broad strokes are consistent across sources. Individual shot descriptions are not gospel.

The Sentinels are the story

Sentinels have always belonged to one franchise and one purpose: giant purple-and-grey robots built by humans to hunt mutants, the central threat of Days of Future Past. Handing them to Doom does two jobs at once. It tells you the Fox mutant world is not a guest appearance in this film but load-bearing scaffolding — a point we argued in our piece on how the Fox universe gets absorbed — and it gives Doom something no previous MCU villain had: an industrial base.

Think about what the last two big bads actually brought. Thanos had a ship and six stones. Kang had variants and a chair. Doom, on this evidence, has a manufacturing line — which is exactly the Doom of the comics, a head of state with a war economy, not a warlord with a magic rock. That distinction is the whole reason we ranked him the way we did in our villain head-to-head.

Doom's origin, narrated by the wrong person

The reel's most interesting decision was who tells you about Victor. According to attendee accounts, the backstory arrives in Sue Storm's voice — Vanessa Kirby narrating over the destruction, describing a man she used to know. The reported lines run close to: he used to be kind, he used to be caring; everything he loved was taken from him; she knew he was lost and did not realise he was broken.

That framing places Doom on Earth-828, the Fantastic Four's universe from The Fantastic Four: First Steps, which is a genuinely elegant solve for the problem everyone has been poking at since the casting: how do you introduce Marvel's greatest villain and his archenemies at once without an hour of exposition? You do not. You let the woman who knew him before the mask do it in ninety seconds. Reed's reported line — Victor, did you do it? — carries a decade of history the audience never had to sit through.

What the reel actually showed

Compiling the consistent elements across accounts, here is the reel as described — with our confidence level attached to each, because a room of people watching once in the dark is not a shot list.

The stolen-lives line is the one worth sitting with. It is a villain telling a room of survivors that their continued existence is a debt — which, if the multiverse is collapsing the way the Incursion rules suggest, is not even entirely wrong. Doom works best when his arithmetic is sound and only his conclusion is monstrous.

The stage was the other announcement

Marvel filled the Hall H stage with the film's cast, and the sheer length of the line-up was itself the message: Robert Downey Jr., Chris Evans, Pedro Pascal, Vanessa Kirby, Paul Rudd, Anthony Mackie, Letitia Wright, Winston Duke, Simu Liu, David Harbour, Hannah John-Kamen, Lewis Pullman, Danny Ramirez, Tenoch Huerta, and the Fox X-Men contingent including James Marsden, Rebecca Romijn and Kelsey Grammer. Ryan Reynolds turned up in a grey Deadpool suit, which the internet has been decoding ever since.

Downey worked the room in character, inviting the crowd to come over to the green side — the kind of showmanship that got him cast in the first place, and a reminder of why the casting backlash has quietened considerably since. Marsden, meanwhile, has been describing his return as a homecoming twenty-seven years on, with a suit he says finally lets him play Cyclops the way the comics drew him. His phrase for it — Cyclops-maxing — did numbers online within the hour, and he is not wrong that the character has been owed this since 2000.

Marvel did not sell the film on who is in it. For the first time, it sold the film on what it is about.

Marvel also used the panel for a September re-release of Avengers: Endgame carrying new footage, a Ghost Rider film with Ryan Gosling under Shawn Levy for 2028, and a Black Panther 3 with Ryan Coogler returning and a new man under the mask. Any one of those is a story on its own; that they were the undercard tells you how the day was weighted.

What we still do not know

• Chris Evans stood on that stage and his role is still officially unannounced — Steve Rogers or Johnny Storm remains open, and our standing file stays open with it
• Whether the Sentinels are Doom's design or salvage from a mutant Earth he has already visited
• Who builds them, who they were originally pointed at, and whether any mutant character in the film has met one before
• Whether the grey Deadpool suit is a story point, a gag, or an unfinished visual effect Reynolds decided to wear anyway
• When, or whether, this footage goes public — Marvel has left it in the room so far

It is worth naming what the Sentinels do to the film's shape, too. Every Avengers finale so far has been a siege: the heroes hold a place while something enormous tries to take it. An enemy that arrives in numbers, on foot, at scale, is the first villain since the Chitauri that lets the Russos stage that kind of geography again — and unlike the Chitauri, these ones mean something to half the cast. Putting Sentinels in front of Cyclops and Magneto is not set dressing; it is a threat with thirty years of history attached to specific faces on that stage.

The other quiet implication is about tone. Sentinels are a persecution metaphor, not a space invasion, and pointing them at a multiversal refugee crisis gives Doom's argument an uncomfortable coherence: he is not exterminating the heroes, he is processing them. If the reel's stolen-lives line is anywhere near the film's actual thesis, Doomsday is building toward something closer to a political horror story than a punch-up — which would make it the strangest, and possibly the best, thing Marvel has attempted since 2019.

That last point is the one to watch. Marvel held Doomsday footage back from the general public while a rival tentpole shares its release date, which is a marketing decision as much as a creative one — and one we unpack in our piece on how December 18 became such a crowded square. Hall H got the reel. The rest of us are still working from the July trailer and a lot of very excited eyewitness testimony.