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 recently shed light on why his movie's ending doesn't align with the post-credits scene of Thunderbolts