The Evan Peters Quicksilver performance was one of the highlights Fox's X-Men movie franchise, and now he officially became part of the Marvel Cinematic Universe in WandaVision (sort of). Peters was «recast» in the role of Pietro Maximoff, the late twin brother of Wanda Maximoff (Elizabeth Olsen). The MCU's Quicksilver was played by Aaron Taylor-Johnson and he died inAvengers: Age of Ultron. The fact that there was a Quicksilver in the X-Men movies and in the MCU is due to the strange distribution of Marvel's character rights. Marvel's X-Men and mutant characters, were owned by Fox, not Disney, for years. This included Quicksilver, a mutant and the son of Magneto in the comics. However, he was also an Avenger, and Marvel Studios retained the rights to the Avengers' lineup of characters when they started the MCU, and Quicksilver was no exception.
As Marvel Studios President Kevin Feige explained in 2012: «There are only a handful of characters that occupy that middle ground… a few gray points even after many years of negotiations … and that only happens with a character like Quicksilver, who has been a part of the X-Men, the son of Magneto in those comics, but also a primary Avenger.» This is why Marvel Studios were able to include Quicksilver and the Scarlet Witch in 2015's Avengers: Age of Ultron, despite Fox beating Marvel to the punch by debuting their own version of Quicksilver a year earlier in X-Men: Days of Future Past. Yet the two Quicksilvers had no relation to each other besides their power — super speed — and the fact that they had white hair. The MCU's Pietro Maximoff was given his powers by the Mind Stone but the X-Men's Evan Peters Quicksilver — named Peter Maximoff — was a mutant whose father was Magneto
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