It is a bold move for Marvel Studios to make. This is the primary reason Peters' appearance in 'On a Very Special Episode.' is so shocking. So, the character was recast with Taylor-Johnson for the MCU's Age of Ultron. As such, it has generally been accepted that this character would cross over into the MCU due to the various intricacies of rights. Like Magneto and his erasure from Wanda and Pietro's MCU backstory, Peters' Quicksilver is part of 20th Century Studios' X-Men franchise which means his version of the character doesn't exist in the MCU.

Peters went on to play Quicksilver in two more X-Men franchise installments: 2016's X-Men: Apocalypse and 2019's X-Men: Dark Phoenix. There is more of a nod toward the possibility Quicksilver is Magneto's son in Days of Future Past than in any other Marvel movie, and that parentage is outright confirmed in later X-Men movies. Quicksilver was recruited by Professor Xavier ( James McAvoy) and Wolverine ( Hugh Jackman) because his unique skill set made him the perfect additional asset to help jailbreak Magneto ( Michael Fassbender). This version of Quicksilver was introduced as Peter Maximoff, a high school kid who liked to use his super-speed for delinquent purposes. Peters first appeared as Quicksilver in 2014's X-Men: Days of Future Past. Peters has been playing Quicksilver for much longer than Taylor-Johnson, not just in terms of chronological time but also in terms of the number of movies he's appeared in. Pietro is eventually killed in the final battle, dying from gunfire aimed at Hawkeye and a young Sokovian boy. Pietro and Wanda spend most of Age of Ultron's runtime helping Ultron ( James Spader) but when they learn he wants to destroy humanity, defect to the Avengers to help destroy Ultron. The twins survived and, as a result, had their superpowers. Radicalized as teens, the twins volunteered to HYDRA to be experimented on by Wolfgang von Strucker ( Thomas Kretschmann). So, in Age of Ultron, we learn Wanda and Pietro were twins from Sokovia who were orphaned at age 10 when a Stark Industries missile flew into their apartment building and detonated, killing their parents. The MCU took some liberties with Wanda and Pietro's backstory, in part because they had to exclude Magneto (that character belongs to 20th Century Studios' X-Men universe, which, because of the way Marvel's rights are divvied up, couldn't allow Marvel Studios to name the character at the time). Pietro appeared in one MCU movie, Avengers: Age of Ultron, and was played by Aaron Taylor-Johnson in that movie. While Pietro has had a long and eventful life in the comics, his time in the MCU was much, much shorter. Pietro's superpowers include super speed, speed physiology (basically, having a body that doesn't wear out by going extremely fast), enhanced durability, flexibility, and strength, and all of the fun extras that come with being a superpowered human. (It's a good thing, too, because Magneto is an extremely terrible parent to his kids in the comics.) As the twins grew older, they eventually met Bova and learned the truth of their parentage. Eventually, Bova gave the twins to a different couple who had lost their own children, and Wanda and Pietro were raised as their own. Magda gave birth to the twins in secret with the help of a sentient cow named Bova on Wundagore Mountain and left the twins in Bova's care.

The basic gist is this: Wanda and Pietro are the children of Magneto and his wife, Magda. In Marvel Comics, Wanda and Pietro's origins are oddly complex for superheroes, with the origins tweaked and refined over the years. So, the basics: Quicksilver is the superhero nickname of Pietro Maximoff, twin brother of Wanda Maximoff. Before we get too deep into this, we should just do the speediest of overviews on Quicksilver, one of the fastest characters in the Marvel Comics canon.

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