Galactus is the Devourer of Worlds — a cosmic entity of incomprehensible power who sustains himself by consuming the life energy of entire planets. Created by Stan Lee and Jack Kirby in 1966, Galactus is not evil in any conventional sense; he simply exists beyond human morality, as indifferent to individual life as a storm. His introduction in Fantastic Four was a landmark moment in comics — the first villain who was literally a force of nature rather than a person with a grudge.

Reference:

Galactus on Wikipedia

https://en.wikipedia.org/wiki/Galactus