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It depends on the writer. A well-fed Galactus was able to defeat one Mad Celestial in Hickman's Fantastic Four, but was defeated when the other three Mad Celestials combined into a larger celestial. A well-fed Galactus should be at least as powerful as Arishem, Considering Jonathan Hickman confirmed that the Celestials from Earth-4280 are as powerful as their Earth 616 counterparts.

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