Wandavision literally makes no sense at all if you haven't seen at least two or three other Marvel movieshttps://twitter.com/dinbarnes/status/1362837128103755776 …
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I don't know I agree; not knowing he's from a FOX X-Men movie might lose some impact, but "she recast Pietro" gets the message across so that you can follow the story. Marvel Studios is good at making sure you don't have to invest a lot of time in watching everything.
You certainly benefit if you do, but it isn't necessary to follow along. They don't tell you what caused the Blip, either, but what it was and that it happened to Wanda and Monica is made clear.
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