Iron Man and Thor guest star in "Double Trouble" Part 4 of 5. Story and Art by Walter Simonson. Cover by Walter Simonson. The Black Celestial enters the time bubble and joins the confrontation between the Fantastic Four and Galactus! But who is the celestial going to help? It's a cataclysmic showdown! Meanwhile, what villain is secretly manipulating the Human Torch behind the scenes?