Its the end of the world that Marvel Studios has been building for a decade.
Or, at least, it could be.
The video wasnt released publicly, but heres a rundown of what fans saw in the hall …

Credit: Marvel
Almost every single hero weve ever introduced is going to be in that film.
Marvel Studios president Kevin Feige teased the crowd as the presentation began.
Feige introduced the actor inhabiting that cosmic character.
Thanos bows to no man, the producer said.
Asked what it was like to play the towering, purple skin tyrant, Brolin said simply: Powerful.
Weve been shooting all year, we wrapped the half-way mark on the movie, Feige said.
Late last night a bunch of people got on a plane in Atlanta so they could be here.
We also have a Hulk ladies and gentleman, Mark Ruffalo, Feige said.
And you brought a friend from work, didnt you?
The Mighty Thor Chris Hemsworth!
Finally, the actor Feige described as the man who started it all, Robert Downey Jr.!
Downey then cut to the chase, nudging Feige to show a clip.
Come on, come on, lets see it!
The footage dovetailed nearly seamlessly into the new footage fromInfinity War.
Something large was once in this sector of space a planet, maybe?
Now it is gone.
Out of nowhere, a creature thuds against their windshield.
The Guardians bring the stranger in, and Mantis revives him.
Who the hell are you guys?
Thor asks the motley crew.
From there, its rapid-fire imagery.
But this … does put a smile on my face, the space-tyrant says.
Run from it, Thanos says.
But destiny still arrives.
Its definitely the end of that world.