The Marvel characters previously owned by 20th Century Fox are already starting to appear in the MCU. WandaVision has just added Evan Peters' Quicksilver to its cast, and The Falcon and the Winter Soldier is set to feature an X-Men connection, too. But Doctor Strange in the Multiverse of Madness could be the first Phase 4 entry to really get to grips with the new influx of heroes received from Fox.