Marvel's Eternals movie draws on comic book lore that sets up the introduction of the MCU's Galactus. Eternals is best seen as something of a love letter to the late Jack Kirby, one of the comic book industry's greatest legends. The Eternals — and the space-gods who created them, the Celestials — were one of Kirby's grandest creations, initially envisioned as something entirely separate from the mainstream Marvel universe; under Kirby, the closest they came to a tie-in was a battle against a Hulk android.
The MCU's Phase 4 increasingly feels as though it is influenced by Kirby's sense of grandeur, and as such it's appropriate that, according to screenwriter Kaz Firpo, Eternals sets up Galactus, one of Kirby's most remarkable cosmic antagonists. Back in 1965, Stan Lee decided he wanted a story in which the Fantastic Four fought God, and Kirby came up with the design for what became Galactus, Devourer of Worlds. There's a sense in which all Marvel's cosmic stories spring from «The Galactus Saga,» because suddenly it was clear to comic book writers and artists that crazy space stories really did resonate with their readers. Kirby was always wary of overusing Galactus, whom he wanted to be a unique villain — an enemy who could never be defeated in battle and thus had to be outsmarted.
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Marvel regained the film rights to Galactus after Disney acquired the bulk of Fox's film and TV assets in the Disney-Fox deal, and as such it's surely only a matter of time before the Great Destroyer appears in the MCU, potentially as the next Thanos figure, a villain who could dominate an entire phase. Some aspects of the setup are subtle, others are overt, but
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