• Warning: Major spoilers ahead for "The Fantastic Four: First Steps."
• Sue Storm (Vanessa Kirby) is part of a thrilling ending to the movie.
• The movie also teases how The Fantastic Four will be part of "Avengers: Doomsday."

"The Fantastic Four: First Steps" follows superheroes Reed Richards (Pedro Pascal), his wife Sue Storm (Vanessa Kirby), her brother Johnny Storm (Joseph Quinn), and their friend Ben Grimm (Ebon Moss-Bachrach) as they take on their biggest adversary yet, Galactus (voiced by Ralph Ineson).

With several versions of "The Fantastic Four" told over the decades, director Matt Shakman skips the origins of how the foursome gained their superpowers and dives right into the action, which is heightened by the fact that Sue Storm is also pregnant.

That news complicates things by the middle of the movie, when The Fantastic Four learn that Galactus wants to destroy Earth after a visit from his herald the Silver Surfer (Julia Garner). The heroes travel lightyears to bargain with Galactus, but the villainous devourer of worlds learns of the child and its powers, which are still unknown to Sue and Reed. Galactus tells The Fantastic Four that if they give him the child, he will spare Earth.

They refuse, escape Galactus and Silver Surfer to return to Earth (the baby Franklin is born during all the madness), and race against the clock to figure out a way to save Earth before Galactus travels there.

Sue Storm risks it all to save her child

After Richards' plan to teleport the entire planet somewhere else in space fails, the movie ends with The Fantastic Four using Franklin as bait in Times Square. All Galactus has to do is get near a portal Richards has created, and he will be sucked to another part of the universe.

Everything goes according to plan until right when Galactus gets near the portal and figures out The Fantastic Four moved Franklin. After the heroes battle Galactus but aren't able to stop him, he looks to have finally won, as he has the baby.

But Sue Storm uses all of her powers to force Galactus into the portal, with a final push from The Silver Surfer, who turns out to only be working with Galactus so she could spare her own planet from being destroyed by him. Earth is saved, but Sue looks to be dead.

Richards tries to revive her but is unsuccessful. Franklin is crying and is reaching out to his mother. Richards lays Franklin on her chest. Suddenly, Franklin revives Sue by putting his hands on her. Sue's eyes glow, and then she begins to breathe. She later tells Richards that their child is much more powerful than they are.

The movie's mid-credits scene reveals how The Fantastic Four could be involved in 'Avengers: Doomsday'

It's clear that Franklin will be a major focus in future "Fantastic Four" movies and the MCU as a whole.

The movie's mid-credits scene jumps to four years later, when Franklin is now a toddler and Sue is reading him a book. She walks away from him to get another book to read, and when she returns, she sees a person in a green cloak holding a mask while leaning over Franklin. The boy is touching his face, which is blocked by the hood he has on.

It's clear that this is Doctor Doom. The screen then cuts to black, and text appears that says, "'The Fantastic Four' will return in 'Avengers: Doomsday,'" which hits theaters in December 2026.

The biggest jump Marvel Studios will have to make is getting The Fantastic Four, who are living in 1960s Earth-828, to where all the "Avengers" action takes place, which is Earth-616.

This tease may be a clue as to how that's done.

It seems, just like Galactus, Doctor Doom (who will be played by Robert Downey Jr. in "Doomsday"), can sense Franklin's powers. It's possible he may trick The Fantastic Four into building something that will transport him to Earth-616. We'll have to wait until "Avengers: Doomsday" to find out for sure.