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,

The Fantastic Four: First Steps director Matt Shakman has revealed that a major change regarding Franklin Richards was made from the original script.

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.

First Steps introduces plenty of characters to the MCU, but its strongest one isn't Galactus or Franklin Richards.

Franklin’s powers allowed him to create the universe, dimensions, avoid mind control, and every other cool power you can think of. Franklin Richards is considered a Beyond Omega Level mutant, and he is the only one in that category, making him the most powerful mutant on Earth.

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.

Wondering which universe Doctor Doom comes from in the MCU? The Fantastic Four: First Steps credits scene hints at a powerful connection between Doctor Doom and Earth-828. With Franklin Richards’ powers drawing attention and Latveria’s presence confirmed,

First Steps will introduce one of the comic's mightiest characters, who Kevin Feige says has a bright MCU future.