First Steps director Matt Shakman recently opened up about Galactus' role in the movie and detailed how the villain was brought to life. Shakman confirmed Galactus as the film's main threat and explained why the team used practical effects instead of only motion-capture.

First Steps director explains why Galactus was chosen to be the main villain instead of Doctor Doom in the MCU reboot.

However, it was ultimately decided to leave Doctor Doom out of First Steps, and I get the rationale that Matt Shakman provided. Victor von Doom has appeared in the previous three Fantastic Four movies (four if you count 1994’s unreleased flick),