What ensues is a wild trip across alternate realities in a rush to save America's life – and to prevent a powerful force from shattering the very fabric of reality. When America Chavez (Xochitl Gomez), a teenage girl with the power to traverse the Multiverse, arrives at the doorstep of Doctor Strange (Benedict Cumberbatch) with a bewitched demon on her tail, Strange goes to the one person he knows would have the power to help her and has sufficient knowledge in witchcraft, Wanda Maximoff (Elizabeth Olsen) aka the Scarlett Witch.