Tim Story the director of Fantastic Four says that he "couldn't wait to see Galactus to life in Marvel Cinematic Universe. When referring the Fantastic Four duology in a 2014 interview the story defined why 20th Century Fox "shied away" from larger than life design of the classic Marvel Characters.
The upcoming Fantastic Four reboot from Spider Man trilogy director Jon Watts, would be produced by Kevin Feige.
More about Galactus
Galactus was a mysterious alien being wandered through space and consumed energy of life bearing planets to survive, He is the main antagonist in Fantastic Four: Rise of the Silver Surfer.
Galactus is a Mighty Being with powers like;
Nigh-immortality
Shapeshifting
Size
Speed
Planetary destruction
Cosmic energy absorption
More of Fantastic Four: Rise of Silver Surfer
Galactus was a cosmic enity, born within the universe itself. Galactus preserves the balance of life by eating planets. He sends his herald, the silver surfer, who entered his service in exchange for his planet safety, along the galaxies to search for suitable planets. When the surfer finds Earth, Galactus is called by his servant and travels the whole universe to reach him. When he arrives Dr. Doom's defeat in shanghai, anyway, Silver Surfer has learned the value of life and confronts him. The Surfer faces his master in space and releases the cosmic Power Galactus gave him at once, thus destroying him.