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A Black Widow spin-off movie for Scarlett Johansson has been a long time coming given her status as the most prominent woman in the Marvel Cinematic Universe. Having been killed off in the last Avengers film, though, her character’s eponymously titled solo outing is more swan-song than rebirth, a fan-servicing way to fill in the mysterious super-assassin’s backstory in the full knowledge that this is it for the character.