Fantastic Four

For me it's

Captain America Brave New World (especially since it premieres in less than a week)

Thunderbolts*

The Fantastic Four First Steps

Note: If you're not exited for any of these don't comment, I don't want a fight in comments section.

Because if Reed Richards can't create a wormhole for his team to travel through the Multiverse, then the TVA will help them escape the destruction of their universe by the very end of the film.

And will become part of their family and additional member like in the comics?

Suppose maybe Miles Teller might one day return to reprise his portrayal of Reed Richards in a future film? I mention this because his poor excuse of a Fantastic Four film reboot was loosely based upon the team's iteration in Marvel's "Ultimate" imprint, which eventually saw him become the malicious villain known as the Maker; and he's since joined the main Marvel Universe, Earth-616, serving as an adversarial foil to the Mister Fantastic that we've all come to know and love. So perhaps Teller's iteration could be revealed to be the Maker in a future M.C.U. entry, serving as an enemy foil to Pedro Pascal's portrayal here. Obviously, this is just an idea, but that would be interesting, if you ask me.

12 members each aside two teams in Avengers: Doomsday, one team battling Dr. Doom on a different earth that’s his conquest and the others fighting against his Doom new ally’s The New Illuminati (Earth-838). If you actually look at the title “ Doomsday” it’s pretty obvious Doom’s invading the different earths across the multiverse by stolen technology from the Watcher. Order to created 'One World Under Doom' known as Battleworld that'd be the setups for Avengers: Secret Wars, that’s gonna be the whole plot with the heroes from mainline universe assembled by TVA preventing Doctor Doom from reaching his goal, if he reaches the godlike powers then he will go after the God of Stories.

Half way through the movie they'll be joined by the Fantastic Four, who play the same sized role as the Guardians played in Infinity War. Half of Thunderbolts will join both Avengers and Fantastic Four. Alongside Wolverine, Captain Peggy, and Deadpool assist as well.

That both team considered would be:

A-Team: Captain America, War Machine, Thor, White Widow (Yelena Belova), Hawkeye (Kate Bishop), She-Hulk, US Agent, Wolverine (if Hugh would wants to came back as Logan for second if not be someone else filed his spot), Spider-Man (who keeps the mask on the whole movie), Ant-man, Stature (Cassie Lang) and Doctor Strange.

B-Team: Captain Peggy, Clea, Captain Marvel, Winter Soldier, Deadpool, Ms. Marvel, White Vision, America Chavez, Invisible Woman, Mister Fantastic, The Thing and Human Torch.

Meanwhile, Smart Hulk leads the operation from the Time Variance Authority Office with help from Ouroboros in the similar role in Avengers: Endgame.

The film would have both teams form quickly to have dealt with facing multiverse threat among their pay grade together, then making up by connection between them all by forcing them to forge dynamics and work together under pressure.

I think they'll do something similar to what Arrowverse did with their Crisis on Infinite Earths. Some earths (for example MCU and Fox, F4, and some more) will combine with each other which will result in a new earth with rewritten history in which all those people who were transported always lived there. It will also result in new heroes and villains. That's just my idea of what they might do, which sounds more likeable than rebooting the whole thing and making 19 years of movies and shows pointless. If they sticked with Kangs instead of replacing them with Doom, it would've been a good way to introduce him in the MCU.

To The Fantastic Four: First Steps?

Captain America Brave New World?

Thunderbolts*?

The Fantastic Four First Steps?

Like with Deadpool & Wolverine?

Will be worse than Fant4stic 2015?

Don't want

• Have Doomsday begin with Doctor Doom killing the Council of Kangs and murdering Rama-Tut, Scarlet Centurion and Immortus. (If they're not the villains in Avengers 5 or Avengers 6, then save them for later)

• Having Doctor Doom with Kang the Conqueror's head as a trophy (Doctor Doom had killed several Marvel heroes and villains in the Fortnite Marvel event, "Absolute Doom," such as Thanos and Ultron, etc.)

• Have Doctor Doom interact with the Multiverse and the Sacred Timeline (that's Kang's business)

Want

• Have Doctor Doom meet his previous live-action counterparts (played by Julian McMahon and Toby Kebbell. Probably not Joseph Culp since he may have retired or passed away)

• Fight the Fantastic Four (obviously since Doom is a Fantastic Four villain)

• Have Doom interact with Shalla-Bal, the Silver Surfer

• Having Doom interact with Galactus

Spider-Man, Fantastic Four and Thunderbolts would still appear in it?

He can come from their universe .

What would the saga be and who would be the big bad villain?