MCU Rumor Roundup: Avengers: Doomsday BTS "Problems", BND Ad May Hint At Sadie Sink's Role, & More - Spoilers

MCU Rumor Roundup: Avengers: Doomsday BTS "Problems", BND Ad May Hint At Sadie Sink's Role, & More - Spoilers

In this latest rumor roundup, we have more details on the supposed behind-the-scenes issues causing problems for Avengers: Doomsday, a new Spider-Man: Brand New Day theory, and more...

By MarkCassidy - Jul 10, 2026 10:07 AM EST
Filed Under: Marvel Studios

Earlier this week, John Campea reported that the post-production process for Avengers: Doomsday might not be going particularly smoothly, and he has now shared some additional details.

On the latest edition of his YouTube show, Campea said he'd heard that directors Joe and Anthony Russo and their crew weren't "finding the movie in the edit."

"Apparently, when they shot the movie, everything felt great, everything looked great... but now that they're editing, they're discovering some issues."

Possibly in an attempt to keep all bases covered, Campea did add that another well-placed source reached out and said, "That's not what I heard."

So, this might be a complete nothing burger, but it is worth noting that this isn't the first time we've heard that Doomsday might not be coming together as well as Marvel Studios had hoped.

At the end of the day, all that matters is what winds up on screen this December.

Possible spoilers follow.

Next, Daniel Richtman is reporting that Doomsday will feature "cameos of characters from the Thor franchise" (not the first time we've heard this), and: "Without spoiling it, I'll say Doctor Doom has a kill in the movie that is SHOCKING for a Disney movie."

We assume he's referring to Doom killing Steve Rogers and Peggy Carter's son as revenge for the death of his own family, but considering that rumor has been out there for a while, is there a chance the villain will take out another character in a surprisingly brutal fashion?

On this week's episode of The Hot Mic, Jeff Sneider said that he has also heard that Black Panther 3 will introduce a mutant character, but he was told it will not be Magneto. This theory seems to have originated with a previous rumor that Denzel Washington will play a new take on the Master of Magnetsim. Sneider adds that it "could be Storm."

Finally, a new Spider-Man: Brand New Day McDonald's Mexico advert has been shared online, and there's speculation that the brief commercial may hint at the identity of Sadie Sink's character.

The ad shows a young girl with red hair surrounded by a pink energy glow running through the restaurant. A stretch? Absolutely, but previous BND tie-in marketing and merchandise have suggested that Sink might be playing Jean Grey, so there might be something to it.

What do you make of these latest MCU rumors? Let us know in the comments.

Avengers: Doomsday and Avengers: Secret Wars were hit with significant delays last year, with Doomsday now set to arrive in theaters on December 18, 2026, and Secret Wars positioned for December 17, 2027.

Both movies will be directed by the Russo brothers, who also make their MCU return after helming Captain America: The Winter Soldier, Captain America: Civil War, Avengers: Infinity War and Avengers: Endgame.

"Being able to create stories and explore characters within the Marvel Universe fulfilled a life-long dream of ours, and we discovered a powerful connection with audiences in each film that we made. We’re thrilled to collaborate once again with Kevin, Lou and the entire Marvel team to bring this epic adventure in storytelling to new and surprising places for both the fans and ourselves”, said The Russos in a statement after the SDCC panel.

Doomsday will star:

Paul Rudd as Ant-Man, Simu Liu as Shang-Chi, Tom Hiddleston as Loki, Lewis Pullman as Sentry, Florence Pugh as Yelena, Danny Ramirez as Falcon, Ian McKellen as Magneto, Sebastian Stan as Bucky, Winston Duke as M’Baku, Chris Hemsworth as Thor, Kelsey Grammer as Beast, James Marsden as Cyclops, Channing Tatum as Gambit, and Wyatt Russell as U.S. Agent

Along with Vanessa Kirby as Sue Storm, Rebecca Romijn as Mystique, Patrick Stewart as Professor X, Alan Cumming as Nightcrawler, Letitia Wright as Black Panther, Tenoch Huerta Mejia as Namor, Pedro Pascal as Reed Richards, Hannah John-Kamen as Ghost, Joseph Quinn as Johnny Storm, David Harbour as Red Guardian, Ebon Moss-Bachrach as The Thing, Anthony Mackie as Captain America, and, of course, Robert Downey Jr. as Doctor Doom.

About The Author:
MarkCassidy
Member Since 11/9/2008
Mark Cassidy is a writer, photographer, amateur filmmaker, and Rotten Tomatoes-approved critic from Dublin, Ireland.
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JabbaTheSus
JabbaTheSus - 7/10/2026, 10:06 AM
At this point, I really don't see who else Sink would be playing. With this and the Funko Pop that was leaked a while back, where she also had pink energy/powers waving around her head. I guess we'll find out in 3 weeks, but seems pretty well in the bag at this point she's playing Jean IMO. As far as the Doomsday rumor... I don't know how much weight to put in this. Isn't the point of an edit to piece together/"find" the movie so to speak? I am insanely pumped for it in December, but really holding Marvels feet to the flame as far as bringing back the old feeling of excitement and spectacle of the MCU
Gnostic
Gnostic - 7/10/2026, 10:24 AM
@JabbaTheSus - Dude, that “Funko Pop toy” was prank made by a YouTuber. He made a whole video explaining that he used AI to alter an image of a Christine Palmer toy from MoM.

Here is a video of him explaining:

https://www.tiktok.com/@andresnavytiktok/video/7649169091386789141
Gnostic
Gnostic - 7/10/2026, 10:40 AM
@JabbaTheSus - Also, the girl in the ad is brunette. The aura around her is crimson-colored rather than pink, which is likely to represent Spider-Man’s costume as she has his powers.
BiffDitko
BiffDitko - 7/10/2026, 10:54 AM
@JabbaTheSus - I don't want to burst your bubble, but Google "The Persuader".
Granted it would be no big deal to Swamp him out with Jean AND the fact that she has supposedly signed up for 3 more movies AFTERWARDS really does lend to the fact she COULD be Jean. But then again...
JabbaTheSus
JabbaTheSus - 7/10/2026, 10:56 AM
@Gnostic - ah true enough, I missed that I guess. Well either way, we'll see in 3 weeks
JabbaTheSus
JabbaTheSus - 7/10/2026, 10:57 AM
@BiffDitko - Yea I looked into it a week or 2 ago. Very possible. It's pretty wild tbh that her role hasn't fully leaked or been revealed. My bet is either at Comic-Con or they'll just fully wait for the movie.
Gnostic
Gnostic - 7/10/2026, 11:04 AM
@BiffDitko - Her having a 5-picture rumor from MyTimeToShineHello (who we know is mostly full of shit). Kevin Feige said that they don’t lock actors into long contractual obligations anymore. The actor for Crossbones also had a 7-picture deal.
Gnostic
Gnostic - 7/10/2026, 11:14 AM
@JabbaTheSus - I don’t think it is that wild. Because Ben Kingsley and Evan Peter’s true roles never leaked online either. In the 2010s, Marvel was known for being a secretive studio that prevented major plot leaks. They also successfully fooled everyone (including Variety and Deadline) into thinking that Jude Law was playing Mar-Vell for over a year, until the trailers and toy leaks dropped hints that he was Yon-Rogg.

The reason why Phase 4 and 5 had so many leaks was due to the pandemic making it harder to keep things under wraps. Those Phases also had too many projects for their security team to oversee.
Bucky74
Bucky74 - 7/10/2026, 10:11 AM
Doom killing Steve and Peggy’s son would be a colossal mistake. That’s dark when horror films do it and a bridge to far that WILL 100 percent turn many main stream audiences off
skullkiddd
skullkiddd - 7/10/2026, 11:39 AM
@Bucky74 - God forbid there’s stakes in a movie called “Doomsday”
Bucky74
Bucky74 - 7/10/2026, 11:46 AM
@skullkiddd - That’s not “Stakes.” Stakes would be threatening Steve’s son and all of existence. That’s straight up child murder
BiffDitko
BiffDitko - 7/10/2026, 11:53 AM
@Bucky74 - IDK, Doom.needs to do something despicable. That would definitely be along those lines. Nat committing what amounts to suicide in Endgame was pretty dark too. T'Challa's pops getting blown up was dark, Aunt May dying viva Goblin glider, also dark. Doom killing a kid is dark but it's not that dark from the other stuff over the course of almost 20 years.
Bucky74
Bucky74 - 7/10/2026, 11:59 AM
@BiffDitko - I personally think it goes way too far and that general audiences will be very turned off by it. There are a million other story ways to make us hate Doom and show his menace that wouldn’t alienate families that onto see this together and many viewers
MrDandy
MrDandy - 7/10/2026, 10:14 AM
Wow, great breaking story, Campea. The movie is both not good and good according to your two different, made up, non-existent sources.
Orphix
Orphix - 7/10/2026, 10:14 AM
Maybe it's Peggy who gets bumped off?
TheVisionary25
TheVisionary25 - 7/10/2026, 10:22 AM
@Orphix - certainly could be possible.
Scarilian
Scarilian - 7/10/2026, 10:24 AM
@Orphix -
Disney are dumb and they think they need to be dark/edgy like DC were so the rumors point to Doctor Doom killing Steve Rodger's son.
Feralwookiee
Feralwookiee - 7/10/2026, 10:26 AM
Boy, I always wanted to see RDJ return as a villain who murders a baby.
DocSpock
DocSpock - 7/10/2026, 10:37 AM
@Feralwookiee -

Like me, that baby is half Hispanic. How will Hollywood spin this horrific race crime? Is it time for burning, looting, and rioting? No.

Feralwookiee
Feralwookiee - 7/10/2026, 12:11 PM
@DocSpock - Only the good half. 😝
Gnostic
Gnostic - 7/10/2026, 10:31 AM
“previous BND tie-in marketing and merchandise have suggested that Sink might be playing Jean Grey”

That was a prank made by a YouTuber. He made a whole video explaining that he used AI to alter an image of a Christine Palmer toy from MoM. Here is a video of him explaining it:

https://www.tiktok.com/@andresnavytiktok/video/7649169091386789141

Also, that girl is a brunette. The aura around her is crimson rather than pink, which is likely to represent Spider-Man’s costume as she has his powers.
TheVisionary25
TheVisionary25 - 7/10/2026, 10:34 AM
So Campea’s “scoop” is possibly a nothingburger…

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Also I get if some don’t want Doom killing Steve’s kid in this but it would certainly be shocking and not safe which you or atleast the people who complain about the movies being safe have to commend as a big & bold swing!!.

Plus , anyone who dies in this movie has a possibility of being resurrected in SW or beyond so not a big deal imo.
BiffDitko
BiffDitko - 7/10/2026, 10:52 AM
As far as Sink's role in "Brand New Day" is concerned: anybody remember the time that The Punisher and Spidey fought Tombstone and a MUTANT with mind control based powers called "THE PERSUADER"? I remember, and Pepperidge Farm remembers too.
Gnostic
Gnostic - 7/10/2026, 10:58 AM
@BiffDitko - The villain of the movie seems to be a composite character inspired by multiple Spider-Man villains. Mainly Carrion (William Allen) and the Queen (Ana Soria). The latter is also a mutant.

The outfit also seems to be inspired by Gabriel Stacy’s Kindred costume. He was also a hooded mystery villain who wore a green jacket.
newhire13
newhire13 - 7/10/2026, 11:14 AM
If that death in Doomsday is real everyone needs to be slapped upside their head. There’s sad and then there’s weirdly cruel. Let’s not suck the fun out of these movies by unnecessarily being weirdly cruel.
TheVisionary25
TheVisionary25 - 7/10/2026, 11:22 AM
@newhire13 - but isn’t that the point?.

Doom seems to be wanting eye for an eye so Steve’s kid and possibly wife for his own family if he blames him for their death so it’s meant to be dark & cruel.

I’m not hoping for infanticide (and I think my own response to it will be somewhat based on how it’s done if it happens) but I could see the storytelling reason for it.
newhire13
newhire13 - 7/10/2026, 11:40 AM
@TheVisionary25 - You can do that without murdering children. It’s just needless, tone deaf, shock value.
TheVisionary25
TheVisionary25 - 7/10/2026, 11:45 AM
@newhire13 - fair enough I suppose.
bobevanz
bobevanz - 7/10/2026, 11:15 AM
I wish I had less integrity. Oh the lies I could make up.. [frick] MTTSH
bobevanz
bobevanz - 7/10/2026, 11:15 AM
That death is also rage bait. More slop the general audiences will never see
SheepishOne
SheepishOne - 7/10/2026, 11:18 AM
Sadie Sink is not playing Jean Grey. Zero evidence beyond scoopers throwing doodoo at the wall.
Lucasberg
Lucasberg - 7/10/2026, 12:26 PM
@SheepishOne - *some evidence. Not conclusive but her yellow hoodie thingie and mind control stuff and obviously red hair creates *some evidence. Could still turn out that shes not jean all the same though.
SheepishOne
SheepishOne - 7/10/2026, 3:19 PM
@Lucasberg - maybe I should have said weak evidence. What people are using as evidence is not exclusive to Jean and makes considerably less sense than some other characters more relevant to Spider-Man.
Lucasberg
Lucasberg - 7/10/2026, 3:59 PM
@SheepishOne - thats fair. It is weak evidence.
skullkiddd
skullkiddd - 7/10/2026, 11:45 AM
Denzel would probably put a great performance in but isn’t Magneto a European Jewish holocaust survivor? Maybe that doesn’t make sense timeline-wise anymore but it feels like a pretty fundamental change to the character to make him black. I’m open to it if they do it in a way that honours the character, I guess they’re hoping he channels Magneto’s Malcolm X energy, but it would definitely be a big risk.
newhire13
newhire13 - 7/10/2026, 6:45 PM
@skullkiddd - He wasn’t always. It’s a brilliant addition to his story but it was added in the late 70s/early 80s I think.
cheeseburger
cheeseburger - 7/10/2026, 12:09 PM
Sounds like every other movie made today. Campea just spinning as always
TheFinestSmack
TheFinestSmack - 7/10/2026, 12:10 PM
Imagine having a show where all you can is "I hear things are bad but another guy says thing ain't so bad..."
Lucasberg
Lucasberg - 7/10/2026, 12:27 PM
@TheFinestSmack - lol
IcePyke
IcePyke - 7/10/2026, 12:44 PM
Jean has super speed?

User Comment Image
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