James Spader's Ultron is returning to the MCU after 11 years in 2026's Vision series, but there are many other villains we want to see come back, too.

Will Ultron be returning to the Marvel Cinematic Universe? A new Marvel theory predicts that it could (and might) happen in the new Marvel Cinematic Multiverse that Loki has unleashed. The theory ...

Wanda Maximoff, a.k.a. the Scarlet Witch, joined the MCU as one of Ultron's minions, but eventually betrayed him and joined the Avengers when she saw the destruction he had planned.