Avengers: Endgame dropped a key tease of Black Widow's father.
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Red Skull describes her as 'Natasha, daughter of Ivan.'
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This sets up Black Widow's solo movie (possible spoilers ahead).
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In the comics, Ivan Bezukhov is Nat's recruiter and handler...
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Who eventually becomes a cyborg-and Black Widow must kill him.
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Nat doesn't remember Ivan... so have her memories been altered?
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All will be revealed in the Black Widow movie coming in 2020.
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