Scarlet Witch's brother Quicksilver and WandaVision, explained

WandaVision is calling back to 2015’s Avengers: Age of Ultron, with mentions of the Scarlet Witch’s late brother, Pietro Maximoff, also known as the speedy superhero Quicksilver. Let’s do a quick recap of Quicksilver, the Marvel Cinematic Universe, and the X-Men.

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WandaVision' episode 5: Quicksilver (aka Pietro), explained - Los Angeles Times

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WandaVision' Cast Evan Peters as Quicksilver to Show 'Certain People' Were Messing With Wanda

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Scarlet Witch from Marvel Cinematic Universe

The Untold Truth Of The Scarlet Witch

Wanda Maximoff (Earth-199999), Marvel Database

Does Quicksilver's sister Scarlet Witch exist off screen in the Fox X-verse? - Quora

WandaVision' Finale Cameo: Did an MCU Character Appear in Episode 9? – TVLine

WandaVision Showrunner Jac Schaeffer Speaks Out on Quicksilver's Involvement

WandaVision Star Elizabeth Olsen Speaks Out on Quicksilver Connection