Opening/During the Age of Apocalypse/Meeting with General Thunderbolt Ross

Here is how the Avengers return in Mickey Mouse, the Avengers, and the Age of Ultron.

The film starts in 3600 B.C., an aged En Sabah Nur is about to undergo a transference into a younger body.

The Egyptian worshipers: (chanting) En Sabah Nur!

Little did En Sabah Nur and his horsemen realized, Horus and the royal guards make ready for the attack as they went inside a technologically-advanced pyramid that works off of sunlight.

Inside the pyramid, Death was testing the ability of the regenerating mutant's body with a knife.

Death: Soon, you will rule forever, My Lord.... (as En Sabah Nur lied down and Death came to the young mutant) Sleep. (as he rested) Let the transfer begin.

The moment the body transfer began, Horus signaled for the guards who're betraying En Sabah Nur.

Horus: It is time.

With that, Horus and the resistance fought the Horsemen of Apocalypse.

Famine: Watch over him!

Horus: Down with the false god!

Famine: Horus!

So with that, Horus led the resistance to the attack.

Famine: ???

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