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

First Steps" introduced the most powerful being in the MCU -Franklin Richards – and was pretty nonchalant about it.

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 director Matt Shakman has revealed what the cut sequence featuring John Malkovich's Red Ghost entailed, and explains why we're unlikely to ever see it officially released.

Galactus ends up giving the Fantastic Four an ultimatum, telling a pregnant Sue that he'll spare Earth if she gives up her powerful unborn child to him. The group declines his deal, which further angers Galactus, sending him on a vengeful mission to both destroy Earth and take Sue’s child.

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

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.

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

First Steps is a big hit, and not just because of its massive action scenes and star-studded cast. What really stands out is the emotional center of the story, and it turns out, that came from a very real place.