Galactus is a fictional character appearing in comic book and other publications published by Marvel Comics. Created by writer-editor Stan Lee and artist and co-plotter Jack Kirby, the character debuted in Fantastic Four #48 (March 1966), the first of a three-issue story later known as "The Galactus Trilogy".
Debuting in the Silver Age of Comic Books, Galactus has appeared in over four decades of Marvel continuity, also starring in a one-shot publication Super-Villain Classics: Galactus the Origin #1 (May 1983), and the limited series Galactus the Devourer (Sept. 1999 - March 2000). The character has been featured in other Marvel-endorsed products and merchadise such as arcade and video game, animated television series, action figures, trading cards, and a film, Fantastic Four: Rise of the Silver Surfer.
In 1966, nearly five years after having launched Marvel Comics' flagship superhero title, Fantastic Four, creators Stan Lee and Jack Kirby collaborated on an antagonist designed to break from the archetypal mold of supervillain of the time, and be instead a being of god-like stature and power.
Kirby described his Biblical inspirations for Galactus and an accompanying character, an angelic herald Lee dubbed the Silver Surfer:
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Links: Wikipedia Entry - Galactus Marvel Database Entry Marvel Universe Entry