The Fantastic Four's Invisible Woman, Susan Storm, is one of the few Marvel characters who has singlehandedly killed a Celestial, one of the almighty space gods who can destroy entire planets on a whim. Susan is commonly recognized as the most powerful member of the Fantastic Four, but this feat proves she is also Marvel Comics' strongest hero.
Susan Storm began her career as the weakest member of the Fantastic Four. The ability to turn invisible paled in comparison to her brother Johnny's fiery power, Ben Grimm's strength and resistance, and even Reed's stretching abilities. Pretty soon, however (starting with Fantastic Four vol. 1#22), she realized she could also project and manipulate powerful force fields that are incredibly resilient and malleable. Even this awesome power, however, pales in comparison to the Celestials, cosmic beings as old as the Multiverse that cannot be hurt by mortals and overpower even the gods. Even mighty heroes such as Thor and the Sentry could barely leave a scratch on them, but Susan Storm did much more than that.
Related: Marvel Proves How Insanely Powerful One Fantastic Four Member Is
In Fantastic Four vol.1 #400 by Tom DeFalco, Paul Ryan, John Kalisz, and Scott Marshall, the team (missing Reed Richards, who is replaced by Kristoff, Doctor Doom's adoptive son) finds itself in the middle of a conflict between the Watchers and the Celestials. The Fantastic Four, trying to help their friend Uatu, go against the Celestials, but they are unable to penetrate their armor. Nathaniel Richards, Mr. Fantastic's father, theorizes that the only one who can do that is Susan because the energy of her forcefields comes from «hyperspace,» which is the Celestial's place of origin. Susan is able to break
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