Galactus is a destructive force in The Fantastic Four: First Steps, but the Sacred Timeline is filled with characters who could potentially beat him.
The film features a version of Galactus, portrayed by Ralph Ineson, that is faithful to his comic book origins. He is a being of immense cosmic power, born before the universe, with an existential threat to all life.
Galactus is a force of nature, cursed with a relentless hunger that drives him to destroy inhabited worlds.
This Devourer of Worlds is not just a villain, but a threat that the movie captures on a massive scale.
Author's summary: Galactus is a powerful threat.