
Avengers: Doomsday opens on December 18, and I’ve spent the last few months rewatching the films and shows that feed into it. That’s more than twenty posts, and nobody should have to read all of them before opening weekend, so this is the shortcut, my Avengers Doomsday guide to the setups that matter and what each one’s going to mean in December. It runs over five pages. This page is the three people who’ve carried Captain America’s shield, because the trailers have made that impossible to ignore, then it’s Doom and the multiverse rules, the mutants, Loki and Shang-Chi, and finally Thor, Wakanda and the Guardians. Start with the July trailer if you haven’t seen it, it’s two and a half minutes and I’ll be coming back to it a lot.
Three Men Have Carried the Shield
Steve handed the shield to Sam at the end of Endgame, and almost everything since has been a long argument about whether that was the right call. But the real starting point is The Winter Soldier, where Steve burns S.H.I.E.L.D. down in the third act of a film most people remember for the lift fight. The film presents that as the only available option, which isn’t the same as it being right, and what grew in the hole is more or less everything. Bucky’s road starts there too, and it’s the longest thing anybody’s built in this franchise. The character who couldn’t speak in 2014 is on the roster for December, expected to hold his own in the largest cast Marvel’s ever put together.

Which brings me to Steve himself, because Marvel’s first teaser back in December 2025 was all about him. A motorbike pulls up at a farmhouse, a hand opens a drawer with the old suit folded up in it, and then Steve’s sitting holding a baby, smiling, and the title card says he’ll return. There’s no fight, no shield in anybody’s hand, nothing that looks like a mission. And he’s in the footage since, long-haired and bearded in a dark bomber jacket, grinning at about 1:57 of the July trailer and turning up again at 0:16 of the thirty-second spot, in the same scene as Sam and Scott Lang. So he’s clearly not just a cameo in a flashback, and how that squares with the old man on the bench at the end of Endgame is something I’m happy to wait for. What I notice is how little of that first teaser’s about action. It’s about what he walked away to, and that’s going to be what’s at risk.
Sam, Walker and the Cap Joke
Sam’s the Captain America who had to earn it, and The Falcon and the Winter Soldier spends six episodes making him do that. I said I couldn’t see how a man without the serum does what that shield requires, I said it should’ve been Bucky, and I’m holding most of that because the physics hasn’t gone anywhere. Getting Isaiah Bradley’s name into the Smithsonian is still the best ending that show produces, though, and Brave New World moved me further than I expected. It keeps putting Sam in rooms rather than fights, which felt like the film hedging in 2025 and looks a lot more deliberate now. Sam was never going to be Steve with a different face. And if you’re going up against Doctor Doom, being good in a room might be the skill that counts.


Then there’s John Walker, the Captain America most people have forgotten they were meant to have an opinion about. The best moment in that whole series is still Walker in the public square, taking the serum and killing a surrendering man with the shield in front of a crowd of phones. Bloody shield, silence, credits. So when the thirty-second spot from October has somebody asking “Right Cap?” in a room full of Avengers, and Walker in his beret pipes up with “I was also Cap for a minute,” it’s the funniest thing Marvel’s put out so far and it’s got a nasty edge if you remember how his minute ended. He’s there because Thunderbolts made him part of the team, a lot that inherited the Avengers shorthand without doing any of the work, and it shows every time somebody says the name out loud. So that’s the original, the current one and the disgraced one in one building, and I can’t think of a better way of getting that argument on screen than having them bicker over a title.



