Although The Fantastic Four: First Steps didn’t tease their arrival in the main universe, Shakman did hint at where the MCU is taking the superheroes next. In an end-credits scene, Robert Downey Jr.’s Doctor Doom shows up and engages with Franklin Richards, the son of Sue Storm (Kirby) and Reed Richards (Pascal).

First Steps understands that once a baby is involved, decisions must be made solely on what's best for the baby.