Warning! This post contains SPOILERS for Agatha All AlongDue to all the rumors surrounding the supposedly imminent return of the Scarlet Witch’s son Billy Maximoff to the MCU, one has to wonder how a return is even possible in the first place. First debuting alongside his twin brother Tommy in WandaVision, Billy and his brother were the product of Wanda Maximoff’s grief-based creation of the Hex, a powerful dome of chaos magic placed over the town of Westview which gave her the perfect TV life and family she always wanted. However, WandaVision’s ending didn’t seem to be very kind to Billy and Tommy as far as their MCU futures were concerned.

https://screenrant.com/scarlet-witch-son-billy-wiccan-mcu-return-explained/