Marvel Comics is known for having a wide variety of incredibly dangerous villains and on that list is the oldest being in the universe, known as Galactus. Galactus for those that don't know, is a giant cosmic entity that can only survive by consuming planets. Born as a mortal man named, Galan, who lived during the previous universe (prior to the Big Bang) he merged with the sentience of his universe after it was destroyed, which made him become the entity fans know today.