In the climactic battle of Godzilla: King of the Monsters, Mothra dies protecting Godzilla.
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However, she could still return in a sequel movie like a Godzilla 3. Here's how.
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During King of the Monsters' credits, it's revealed a new Mothra egg has been discovered.
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Mothra likely laid this egg before the fight with Ghidorah, knowing she might perish.
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Then, when she is killed by Ghidorah, Mothra transfers her lifeforce to Godzilla.
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This is what enables Godzilla to be powerful enough to kill Ghidorah - becoming Burning Godzilla.
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Now that Mothra's lifeforce exists within Godzilla, if he were to transfer it back to the egg...
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...Mothra could be reborn in a sequel movie, starting her life cycle all over again.
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