Doomsday theory explores how the Fantastic Four might travel to Earth-616. It suggests Reed Richards uses Galactus’ ancient ship tech, combined with his own inventions, to build multiversal transport and rescue Franklin Richards from Doctor Doom’s grasp.

Marvel Studios head Kevin Feige recently teased a meeting between the Avengers, X-Men, and Fantastic Four at the Baxter Building in Avengers: Doomsday. Following the release of The Fantastic Four: First Steps,

Feige was speaking to the official Marvel website about The Fantastic Four: First Steps, which is now in theaters. It’s the final piece of the puzzle before Avengers: Doomsday comes out in December 2026, and Feige confirmed that the home of the Fantastic Four won’t just play a role; it’ll be a central meeting spot for Earth’s Mightiest Heroes.

First Steps" has a thrilling ending that teases Dr. Doom and where the MCU goes from here in "Avengers: Doomsday."

Avengers: Doomsday stars Robert Downey Jr. as Doctor Doom, plus cast from Fantastic Four and Thunderbolts, like Pedro Pascal, Florence Pugh, and Joseph Quinn.

Fantastic Four' star Vanessa Kirby opened up about working with Robert Downey Jr. on the upcoming 'Avengers: Doomsday,' saying he does 'incredible work' in the film and 'is our leader' on set.

A good chunk of Doomsday could focus on a clash between Avengers and X-Men with RDJ’s Doom cackling in the background, with a kidnapped Franklin by his side. The premise certainly gives the Fantastic Four a reason to breach their multiversal walls and zip over to 616 to meet the New Avengers.

Fantastic Four' actress Vanessa Kirby talks up working with the Russo Brothers on 'Avengers: Doomsday' while in the middle of a pregnancy.

As is usually the case with MCU movies these days, The Fantastic Four: First Steps includes both a mid-credits and a post-credits scene. And also sticking to the traditional formula, one is a goofy little stinger, while another has serious ramifications for the MCU.