The original X Class, the original Brotherhood (plus Blob), their leaders, and Xavier's recruits needed to save his original class from Krakoa. Pietro's cast for the first installment of the rebooted X franchise.
Happy to see the return of a beloved character, sad to see the mix-up of an evil one.
Pietro Maximoff is a very important character in not only the X Universe, but the Marvel universe in its entirity. So he must obviously be portrayed in a live-action movie. But why has he not been?