Avengers: Alternative.

In this alternate universe, the Avengers aren't a team, but all the heroes work alone. You need to gather the Avengers and other heroes against a common threat: Doctor Doom. You thought you learned about the doctor recently—you felt a tremor in the fabric of the universe and realized that someone wants to destroy you. You learned about other universes from America Chavez. You know America Chavez, and you need her to teleport the X-Men and the Fantastic Four, and other heroes—"whatever you want"—to the Avengers Universe. You need to unite the X-Men Universe with its superhumans, the Fantastic Four, the Thunderbolts, the Avengers, and other heroes. As everyone knows, after the battle with Thanos, where Loki and Vision died at Thanos's hands, Natasha died on Vormir to get the Soul Stone and help the Avengers win. And Tony snapped the Infinity Gauntlet and saved the universe. They died, and the Avengers will be without them. Good luck! By the way, you have a very stable psyche, so you're not devastated by the deaths of Loki, Vision, Tony, and Natasha. But sometimes you miss Tony and Natasha.