Galactus is a powerful cosmic being in the Marvel universe, often referred to as the "Devourer of Worlds." He is known for his immense size and hunger, requiring the energy of entire planets to sustain himself. Galactus travels through space in his massive ship, seeking out planets rich in life to consume, which often puts him at odds with superheroes like the Fantastic Four and Silver Surfer. Despite his destructive nature, Galactus is not purely evil. He is a force of nature, maintaining the balance of the universe. His herald, the Silver Surfer, helps him find suitable planets, often leading to complex moral dilemmas for the heroes who confront him.