Do you want to compare Galactus with Callisto? Discover the powers, weakness & weapons of Galactus and Callisto from Galactus Biography and Callisto Biography. Find out all about Galactus and Callisto.# Check out how is Galactus unique and distinct from Callisto. Discover their love interest, sidekicks, family tree and the movies and games list in which Galactus and Callisto have appeared. Find out everything about them here!