Warning: This article contains spoilers about the most recent episode of WandaVision that some readers may prefer to avoid.
WandaVision head writer Jac Schaeffer has discussed the bombshell twist at the end of episode five that saw Wanda's brother Pietro arrive in Westview.
Like Vision (Paul Bettany), Pietro has been previously killed off before reappearing in Wanda's (Elizabeth Olsen) life - but in a further shock, Pietro was played by Evan Peters rather than Aaron Taylor-Johnson.
Taylor-Johnson starred alongside Olsen in Captain America: The Winter Soldier and Avengers: Age of Ultron, whereas Peters portrayed the same character in the X-Men franchise.
"We loved the idea of [bringing him back]," Schaeffer told the Marvel website. "And then we were like, 'how in the world are we going to make this make logical sense? Like, how do we justify this?'
"Because that's the thing, you can hatch a million great ideas, but to make them land, to make them be grounded, to make them feel organic to the larger story."
He continued: "This show is such a mind scramble, and because it's working on so many levels, and there's so many notions of what's real and what's not, and performance, and casting, and audience, and fandom, and all of that, we just thought it would be the biggest thrill to bring Evan over to the Marvel Cinematic Universe."
The potential move to introduce a multiverse into the MCU - something which Schaeffer did not positively confirm - appears to be given weight by rumours that the new Spider-Man film with Tom Holland will also feature his predecessors Tobey Maguire and Andrew Garfield.
The next episode of WandaVision is released on Disney+ on Friday.
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