With Avengers: Doomsday, Marvel is assembling a massive cast of Avengers, X-Men, and everyone in between to fight Robert Downey, Jr. as Doctor Doom. Rebecca Romijn doesn’t know how much of Mystique is in Avengers: Doomsday. Now, Avengers: Doomsday is getting the same treatment, with Loki writer Michael Waldron assisting Stephen McFeely with the script while production continues in London. “There's plus-ing happening every day on the Avengers: Doomsday set right now,” he said at the same event. Avengers: Doomsday hits theaters on December 18, 2026.