I think there's an attack coming.

[Diana Prince] Not coming, Bruce.

It's already here.

They called him Steppenwolf...

..."The End of Worlds".

He lived only to conquer.

Millions fell before his blade.

And rose again as his parademons.

Nightmare creatures, who feed on fear.

[Bruce Wayne] Yeah, I think I met one.

We didn't hit it off.

[Diana Prince] Here in Gotham?

[Bruce Wayne] They're all over.

They're looking for his...

...Boxes?

[Diana Prince] The Mother Boxes?

[Bruce Wayne] Mother Boxes...

I guess Steppenwolf took the one your people regarding that leaves two more.

[Diana Prince] I'm impressed.

[Bruce Wayne] Don't be.

I have no idea what's in them...

...Weapon?

...Some kind of power?

[Diana Prince] They don't contain power.

They are...

...Power.

Carried from planet to planet...

...The Mother Boxes combined to form "The Unity".

An apocalyptic power that not only destroys worlds...

...But transforms them into the primordial hellscape of Steppenwolf's birth world

We should have died...

...But we formed our own "Unity".

Amazons,

Atlanteans,

All the tribes of man fought side by side...

...Warriors of legend,

Allies from other worlds,

Even the gods themselves all acted as one...

Laying down their lives to drive Steppenwolf away.

Some say drove him mad...

...the disgrace of his first retreat.

He swore our alliance would crumble...

...The darkness will cover the earth...

And that he would return...

...When it did.

Left behind...

...The Mother Boxes were too dangerous to be kept together.

One was entrusted to the Amazons...

One to the Atlanteans.

Both sealed and guarded in secure strongholds.

The box of men was buried in secret...

...so that no tribe would be tempted to use its power over another.

Such harmony out of such horror,

...it was truly an Age of Heroes.

[Bruce Wayne] Something tells me we're not getting the band back together.

[Diana Prince] The Atlanteans were forced under a sea...

...and the Amazons to an island...

...they can never leave.

[Bruce Wayne] Oh, I wouldn't count on the tribes of men.

We tend to act like the Doomsday Clock has a snooze button.

How long until...

[Diana Prince] Days...

...at most.

Steppenwolf's mistake last time was attacking us.

He wanted to make the earth kneel before he destroyed us.

This time he'll just go after the Boxes.

[Barry Allen] I got a location for one of our recruits...

...Barry Allen.

[Diana Prince] What about the other one?

Victor Stone.

[Bruce Wayne] I was hoping you would dig him up.

[Diana Prince] We're asking people we don't know to risk their lives.

[Bruce Wayne] I know...

...that's how this works.