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