Galactus is a fictional character appearing in comic books 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 merchandise such as arcade and video games, animated television series, action figures, trading cards, and a film, Fantastic Four: Rise of the Silver Surfer.

In 2009, Galactus was ranked as number five on the pop culture site IGN.com's list of 100 top comic-book antagonists.

From Wikipedia

In case you're wondering, he stands 43 inches tall, 2 feet wide at the antenna, and 1 foot deep!