How Franklin Richards, the power cosmic and Doctor Doom's appearance in "The Fantastic Four: First Steps" credit scene affects "Avengers: Doomsday."

In a 1982 arc by John Byrne, Franklin gets frustrated trying to solve a Rubik’s Cube and uses his powers to age himself into an adult body, though he couldn’t actually gain more emotional maturity. He winds up going back to being a kid, placing restrictions on his own abilities to allow him to have something of a normal childhood.

As the rest of the Fantastic Four mourn her, Reed puts their son on her chest to say goodbye, and then he miraculously resuscitates her. The parents spend most of the movie worried that Franklin might be some kind of monster like Galactus,

First Steps avoids the worst MCU habits, embraces classic family values, and aims high with cosmic stakes—but familiar missteps in the final act diminish what could have been.

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

First Steps" star Vanessa Kirby breaks down Sue Storm's birth scene and her mid-credits moment with Robert Downey Jr. as Doctor Doom.

First Steps director Matt Shakman addresses a big Sue Storm moment in the movie's final act and reveals original plans for Franklin Richards' Marvel Cinematic Universe's introduction.