MCU Rumor Roundup: Sydney Sweeney Eyed For X-Men; Doctor Doom's [Spoiler] In Avengers: Doomsday, & More

MCU Rumor Roundup: Sydney Sweeney Eyed For X-Men; Doctor Doom's [Spoiler] In Avengers: Doomsday, & More

In this latest MCU rumor roundup, we have potential updates on Sydney Sweeney's MCU status, Monica Rambeau's return, Avengers: Doomsday's newest cast members, and more...

By MarkCassidy - Jun 15, 2026 12:06 PM EST
Filed Under: X-Men

In this latest roundup of Marvel Cinematic Universe-based rumors, we have (potential) updates on Sydney Sweeney's MCU debut, Avengers: Doomsday's most recent cast recruits, Monica Rambeau's status following The Marvels' post-credits scene, and more.

As far as we know, Avengers: Doomsday will not see the return of Captain Marvel (Brie Larson), Ms. Marvel (Iman Vellani) or Monica Rambeau (Teyonah Parris), despite a recent rumor that the latter would make an appearance.

In The Marvels' post-credits scene, Rambeau wakes up in a medical lab after getting trapped in an alternate reality following her battle with Dar-Benn to find a variant of her late mother, Maria (Lashana Lynch), by her side. Rambeau is overcome with joy, but Maria - who is actually this world's Binary - has no idea who she is.

As Monica's confusion grows, a familiar voice asks, "How's our patient?" and a comic-accurate, fully CGI take on Hank McCoy, aka Beast, enters the room.

It was generally assumed that this stinger must be setting up the X-Men's return in Doomsday, but MTTSH has now clarified what they meant by a previous post.

The scooper is also claiming that Sydney Sweeney is being eyed for a role in Marvel Studios' X-Men reboot. We've been hearing that the Madame Web star might be on Marvel's radar for quite a while, and MTTSH actually said she was in line to play Emma Frost just a couple of weeks ago.

Does this indicate that Frost will be a part of the reboot? We'd file this one squarely in the grain of salt category for now!

Staying with the long-awaited X-Men movie, and House of the Dragon actress Bethany Antonia (Lady Baela Targaryen) has thrown her hat in the ring to play Storm.

ComicBook.com asked Antonia if there is any specific superhero character she'd be interested in playing. “Oh, Storm, but I think that’s already taken.” When informed that the role likely hadn’t been cast yet, she added, “There’s a rumor, but like, call me.”

Possible spoilers follow.

Finally, Pacino Khan and Matilda Firth, who recently joined the cast of Doomsday in undisclosed roles, are rumored to be playing the children of Doctor Doom - though Daniel Richtman has heard that the villain will only have a son in the movie.

A son who probably won't last very long! Rumor has it that Doom will target Steve Rogers (Chris Evans) after a Multiversal incursion he caused results in the death of his wife and child.

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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Malatrova15
Malatrova15 - 6/15/2026, 12:47 PM
Whats to eye?
GComix85
GComix85 - 6/15/2026, 12:48 PM
Serious question. Does this site have some sort of Sydney Sweeney headline quota they have to meet on a regular basis?
DarkeyeZ
DarkeyeZ - 6/15/2026, 12:53 PM
@GComix85 - They have a click bait quota. Everyone will click on Sdyney Sweeney as she has the best cleavage in the industry.
TemporarilyHere
TemporarilyHere - 6/15/2026, 12:59 PM
@GComix85 -

A pragmatist would tell you that as she's the centre of the spotlight the site is reasonably reporting on the rumours that conveniently seem to sprout out of nowhere hyping her up.

An observant would instead remind you that she also just so happens to be the apple of the eye for many groups whose once banable behaviour is now not only tolerated but even encouraged.

Feel free to draw your own conclusions.
TheJackAss
TheJackAss - 6/15/2026, 1:11 PM
@DarkeyeZ - Those r overrated. Men must not go outside much if those r considered "the best"
TheJackAss
TheJackAss - 6/15/2026, 1:14 PM
@TemporarilyHere - If Sydney thinks being in a bad X-Men movie is gonna help her get bigger roles LMAO
LenSpiderman
LenSpiderman - 6/15/2026, 2:03 PM
@TheJackAss - she’s said herself (and I’m paraphrasing) that her aspiration isn’t to be an actress, it’s to be the embodiment of her own brand/business, and that while she’s young and hot and willing, that she’s going to cash in on people’s desire to ogle her because that’s the most effective money making venture for her “brand”. When that dries up I suppose we’ll see what she does next, but she’s aware the timer is running on her 15 minutes.
TemporarilyHere
TemporarilyHere - 6/15/2026, 2:10 PM
@TheJackAss -

...yup, name sure checks out.

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FrankenDad
FrankenDad - 6/15/2026, 12:49 PM
Get ready to stare into those wonky eyes for a bunch of X-men movies. 😵‍💫
DarkeyeZ
DarkeyeZ - 6/15/2026, 12:52 PM
@FrankenDad - spoiler alert....no one is looking at her eyes
LenSpiderman
LenSpiderman - 6/15/2026, 2:06 PM
@FrankenDad - I don’t think she has eyes… I’ve never seen them, anyway. But I hope if she’s cast, they don’t pin the franchise to Emma frost the way they did with mystique or Wolverine. Or is she the next mystique?
LenSpiderman
LenSpiderman - 6/15/2026, 2:10 PM
@DarkeyeZ - that’s why she’d be a great Emma frost. Marvel long ago decided that no one needed to “look at Emma’s eyes”. In that regard, Sweeney is to frost what Reynolds is to Deadpool. Just a real life comic book character.
DarkeyeZ
DarkeyeZ - 6/15/2026, 12:51 PM
Sydney Sweeney is always "eyed". That's the only thing she ever is.
MarkCassidy
MarkCassidy - 6/15/2026, 12:56 PM
@DarkeyeZ - Well, that and consistently cast in various projects that make her millions of dollars.
TheJackAss
TheJackAss - 6/15/2026, 1:07 PM
@MarkCassidy - & she has had plenty of flops. 4 in a row last year. Her name is not a guarantee draw
FireGunn
FireGunn - 6/15/2026, 1:12 PM
@TheJackAss - No name is a guaranteed draw in 2026
RolandD
RolandD - 6/15/2026, 12:58 PM
Despite The Marvels flopping, I thought that the three leads had good chemistry and I would think that Carol especially and possibly Kamala too try and find a way to bring her back.
TemporarilyHere
TemporarilyHere - 6/15/2026, 1:00 PM
@RolandD -

Iman Vellani deserved better.
TheVisionary25
TheVisionary25 - 6/15/2026, 1:13 PM
@RolandD - I thought it was enjoyable because of their dynamic and chemistry

Nothing great but a fun watch.
TheVisionary25
TheVisionary25 - 6/15/2026, 1:20 PM
@TemporarilyHere - the show was better imo and I do hope we get more with her family since I like their dynamic.

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SolarSoldier
SolarSoldier - 6/15/2026, 1:37 PM
@RolandD - They did!
TheVisionary25
TheVisionary25 - 6/15/2026, 1:48 PM
@RolandD - also thinking about it…

Do they know Monica is trapped in a different universe or do they think she’s dead?.
TheFinestSmack
TheFinestSmack - 6/15/2026, 2:23 PM
@RolandD - @temporarilyhere The Marvels wasn't as bad as people said. But the villain was lackluster (and I am a Zawe fan.) It was also clear they slapped a story together around the concept of the leads switching powers when they use them. All three leads deserve better.
hainesy
hainesy - 6/15/2026, 1:10 PM
They could cast Sydney Sweeney's breasts as planets and it would be believable.
FireGunn
FireGunn - 6/15/2026, 1:11 PM
@hainesy - They casted her breasts as Godzilla in Euphoria Season 3
SATW42
SATW42 - 6/15/2026, 1:10 PM
I dunno, Monica Rambeau in Doomsday seems like a given...
TheVisionary25
TheVisionary25 - 6/15/2026, 1:15 PM
If true then honestly it seems a bit strange to have Monica end up in a universe with the X-Men apparently (even though we only saw Beast) and not pay that off in Doomsday but instead have seperate variants of those characters even though you could have just streamlined it with them being the one that have Monica but we’ll see….

Granted , they could also have decided to keep them seperate due to The Marvels underperforming at the B.O and them not being sure how many ultimately watched it on streaming thus not wanting it to be “homework” for them.

No to Sydney Sweeney , I think she’s fine but I’m just sick of hearing about her all the time lol.

Also if they want to have Storm be younger , Bethany Antonia could work in the role from what I have seen of her tbh!!

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bobevanz
bobevanz - 6/15/2026, 1:15 PM
I wouldn't be surprised because she needs to stay relevant. I also have no beef with her, I just think she can't act for shit.
Nomi
Nomi - 6/15/2026, 1:16 PM
All of you, stop posting MTTSH's "scoops". She just throws shit on the wall and waits, if anything sticks, ffs.
TheVisionary25
TheVisionary25 - 6/15/2026, 1:17 PM
Off topic:
@RorMachine
@JoshWilding

Peter Serafinowicz cast as Peeves the Poltergeist in HBO’s Harry Potter.

https://variety.com/2026/tv/global/harry-potter-peter-serafinowicz-peeves-poltergeist-1236778737/
harryba11zack
harryba11zack - 6/15/2026, 1:20 PM
eye read soo much
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DocSpock
DocSpock - 6/15/2026, 1:26 PM

Perfect for Emma Frost.
Nomi
Nomi - 6/15/2026, 1:36 PM
@DocSpock - agreed
ModHaterSLADE
ModHaterSLADE - 6/15/2026, 1:30 PM
I like Parris in the role, would be cool to do something with the character along with Blue Marvel, like the comics.
HashTagSwagg
HashTagSwagg - 6/15/2026, 1:37 PM
Emma seems too obvious, I'd go with Sage or Boom Boom.

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HelloBoysImBack
HelloBoysImBack - 6/15/2026, 2:13 PM
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gambgel
gambgel - 6/15/2026, 2:17 PM
MytimetoShit I.S A L I A R


just stop, cmb. STOP
TheFinestSmack
TheFinestSmack - 6/15/2026, 2:20 PM
So MTTSH says a character that was left in a cliffhanger situation... will return... but not in the Avengers... unless something changed. Does anyone else not see that this is just more of the same common sense guesswork as always? MTTSH knows absolutely nothing.
test5
test5 - 6/15/2026, 3:12 PM
please no. she's obnoxious.

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