MCU Rumor Roundup: Sadie Sink BND Character Buzz; Will Sebastian Stan Bid Farewell To Bucky In DOOMSDAY?

MCU Rumor Roundup: Sadie Sink BND Character Buzz; Will Sebastian Stan Bid Farewell To Bucky In DOOMSDAY?

We have a few Marvel-related rumors for you guys to have a look at here, including more buzz surrounding a very unexpected character Sadie Sink could be playing in Spider-Man: Brand New Day...

By MarkCassidy - Nov 05, 2025 01:11 PM EST
Filed Under: Marvel Studios

In this roundup, we're taking a look at some MCU-related rumors that have been circulating online, including a possible future Marvel Studios role for an actor who has technically already made his MCU debut in Deadpool and Wolverine, and resurfaced buzz about a certain shape-shifting character Sadie Sink could be playing in Spider-Man: Brand New Day.

Though this is more speculation than rumor, some fans believe that recent comments from Sebastian Stan may indicate that he's preparing to bid farewell to Bucky Barnes in either Avengers: Doomsday or Secret Wars.

During an appearance on the Stronger Podcast, Stan spoke about his time playing the Winter Soldier in the past tense, and suggested that he's ready to move on from the role.

“I have to try to offer something different than before. And I’ve never favored one role over another. The Marvel stuff, I’ll always, till the end of time, [feel it] really helped me grow as a person and helped me grow as an actor and it taught me relationships and [I worked with] Robert Downey [Jr.] and Scarlett [Johansson] and all these people I looked up to. It was a business. It was a family and it gave me a sense of belonging, and it’s always there for that, but it was only the step one for me.”

We think people might be reading a bit too much into this, but we have heard that at a couple of main characters (at least) will be killed off in Doomsday, so Bucky might well be among them.

Next, scooper MTTSH believes that Matthew McConaughey will find his way to the MCU at some point. The Interstellar star did already voice Cowboypool in Deadpool and Wolverine, but this obviously wouldn't get in the way of him playing another character.

McConaughey was rumored to be on the studio's radar to play a new take on Green Goblin back in the day, and has expressed interest in joining a major superhero franchise - as long as the project had the right script.

We've seen this before, but:

We are once again hearing that Sadie Sink may have been cast as Shathra in Spider-Man: Brand New Day.

This rumor previously did the rounds earlier this year when John Rocha reported the following on The Hot Mic.

"The main villain is a female shapeshifter. They've cast the person, but I'm not allowed to say who it was. Not sure if they're the Chameleon or not, but they are a shapeshifter."

Though an immortal wasp-goddess probably wasn't the first character that sprang to mind, The Geeky Cast is now reporting that this villain is indeed Shathra, and Sink is playing her. We're definitely not putting too much stock in this, although we have heard a few strange things about Sink's character from other sources over the past few months.

The Stranger Things star was recently spotted on set wearing what appeared to be combats and army-style boots, which led to speculation that she'll actually be playing Frank Castle's mysterious female sidekick. Of course, if she is a shapeshifter, her outfit wouldn't really matter, anyway.

Finally, a reminder that The Fantastic Four: First Steps is now streaming on Disney+. You can check out a new teaser below.

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harryba11zack
harryba11zack - 11/5/2025, 1:46 PM
"Will Sebastian Stan Bid Farewell To Bucky" ...... im a pretty sure him and walker are gonna die, they gotta force the audience into liking captain falcon some how.
mountainman
mountainman - 11/5/2025, 2:29 PM
@harryba11zack - They probably will kill off the two white guys, but man John Walker is one of the best post-Endgame characters introduced. Even though the writers constantly want you to not like him, he’s still a better character than most of these other clowns.
LenSpiderman
LenSpiderman - 11/5/2025, 8:40 PM
@harryba11zack - I think Cap is in for a recast after a break from the character. I remember hearing (not sure if this was a “scooper” or someone official) that the MCU going forward would potentially return to stories that we’ve seen, but as though they happened in alternate realities (this could be referring to x-men, however, since Fox dropped a turd on most of the x-men’s most famous arcs) and that we’d be getting reimaginings of existing characters. Like the final outcome of secret wars is going to be a potluck of old and new all tossed into one refreshed timeline. Personally they’d be smart to get Evans back and do an alternate timeline period show where he lives out his life with Peggy, but still gets into adventures. A Mr and Mrs Smith situation with those two through the 20th century would be fantastic.
McMurdo
McMurdo - 11/6/2025, 3:57 PM
@LenSpiderman - zero chance
MCUKnight11
MCUKnight11 - 11/5/2025, 1:47 PM
IDK, I think Shathra would feel out of place in what is supposed to be a street level story.
TheVisionary25
TheVisionary25 - 11/5/2025, 2:01 PM
@MCUKnight11 - I agree hence I don’t buy it.

However if that is the character she’s playing , perhaps they could find a way to make it work within this more supposed grounded story.
Truoptimusprime
Truoptimusprime - 11/5/2025, 1:49 PM
I believe the ones that didn't die in Infinity War will most likely bite the bullet in Doomsday!
XRayCat
XRayCat - 11/5/2025, 1:50 PM
Blech... She-Hulk
TheVisionary25
TheVisionary25 - 11/5/2025, 2:00 PM
I think Sebastian is just talking about his career in general since he’s done well outside of the MCU with these indie/mid budget films so he’s just stating that while he loves being part of that universe , he wants to do more and different things as much as possible which he has been…

However if it is the end of the line for Bucky in Doomsday then I could see it since it feels like he’s kinda reached the end of his redemption arc but I don’t think that’s the case tbh.

Also in regards to McConaughey , dudes a good actor but I can’t see Norman Osborn with a Texas twang…

This might be weird but I could see him as an older & weathered Johnny Blaze/Ghost Rider though with Danny Ketch as the younger one.

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MCUKnight11
MCUKnight11 - 11/5/2025, 2:10 PM
As for McConaughey, Norman, Kelly or Stryker.
TheVisionary25
TheVisionary25 - 11/5/2025, 2:22 PM
@MCUKnight11 - him as Stryker could be cool especially if they have him be a priest like he is in the comics.

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Jackraow21
Jackraow21 - 11/5/2025, 2:21 PM
Don’t see Deadpool, Wolverine or Laura on that list but have seen them on others.
WruceBayne
WruceBayne - 11/5/2025, 2:52 PM
Look at how many Super Soldiers there is, somebody’s gotta go.
Wahhvacado
Wahhvacado - 11/5/2025, 2:57 PM
Team wipe them, have Doom bring multiple casualties
Batmangina
Batmangina - 11/5/2025, 4:04 PM
The main villain is a female shapeshifter.

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String
String - 11/5/2025, 5:41 PM
I don't know if Bucky dies in Doomsday or Secret Wars, but if he does, I wouldn't be surprised. Sebastian Stan is one of the few actors that signed an initial 9-film deal with Marvel Studios. Samuel L. Jackson and Chris Pratt who is the only GotG actor acknowledged to return, were other actors who have huge contracts. Chris Evans was given a 9-film deal but refused and signed a 6-film deal instead as did Chris Hemsworth. Both Chris' signed an extension to get themselves to Endgame.

Anyway, outside of cameos, Sebastian Stan has appeared in 3 Captain America films, 2 Avengers & Thunderbolts. That's six films. If he appears in Doomsday and Secret Wars, that's 8 films. I don't know if 'Falcon and the Winter Soldier' replaces a film but if it does, Sebastian Stan's MCU contract may finish at the end of Phase 6 with Secret Wars. He could be one of those characters that sacrifices themselves in order to save the new MCU.
LenSpiderman
LenSpiderman - 11/5/2025, 8:47 PM
@String - he’s also doing very well as an actor outside the MCU. Not everybody in the MCU can say that. He’s had a good mix of movies and projects in different genres that have been critical successes and hit well with audiences. It’s a weird time for movies so it’s hard to pin success to box office, but I can’t imagine he’s unhappy with his body of work. Then again that could go both directions, maybe having a satisfying career outside the MCU will keep him interested in revisiting the character or maybe it will give him the confidence to call it quits with Bucky.
hainesy
hainesy - 11/5/2025, 5:43 PM
I don't know why we could just get a movie about Peter fighting the Scorpion with maybe Mr. Negative pulling the strings instead of JJJ. Gargan gets Scorpion DNA instead of Spider DNA, so he's way stronger and had a mechanical tail that frustrates Spider-Man without his Stark suit. Just have lots of great street battles, like he had with Doc Ock in Spider-Man 2. There's your movie. No interdimensional stuff, no multiverse, just Spider-Man fighting a villain while learning to cope with everyone forgetting about Peter Parker.
ObserverIO
ObserverIO - 11/5/2025, 5:51 PM
No Rogue on that rumored cast list is an automatic fail.
deamon
deamon - 11/5/2025, 5:55 PM
McConaughey has to be 616 Norman Osborn, and Chalamet has to be Harry Osborn.
WruceBayne
WruceBayne - 11/5/2025, 6:58 PM
@deamon - damn good casting but I read that Chalamet said that he was warned against doing superhero movies. Like it would stall his career with being typecast.

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