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Galactus is an ancient being as old as the universe itself, with powers that transcend comprehension. This cosmic giant feeds off the life's energy of entire planets, causing destruction on an unimaginable scale. To aide him in this grim task, Galactus recruits heralds—powerful beings tasked with locating suitable planets for him to consume. Traditionally, these heralds have been noble, intelligent entities. However, this time, Galactus has taken a bold step, choosing Hulk as his harbinger.