Next year, Captain America and Iron Man will battle each other on the big screen in what will be known as Civil War, but another battle has already erupted among the Marvel Studios elite, one that has shaken 2015 to its core. Behold, The Great Agent Carter vs Agents of SHIELD Dubsmash War.

It all started so innocently, with Agent Carter stars Hayley Atwell and James D'Arcy just having a little bit of fun with the Dubsmash app.

Then Agents of SHIELD stars Clark Gregg and Chloe Bennet decided it was time to make a battle of it.

The Carter crew accepted the challenge, and it was on. Atwell and D'Arcy fired three consecutive shots at the SHIELD agents.

But little did they know that SHIELD was planning something big, something that required the entire team and a Peggy Carter costume.

Consider the mic DROPPED. @realhayleyatwell #dubsmashwar2015 @clarkgregg

A video posted by Chloe Bennet (@chloebennet) on

At this point, even D'Arcy seemed ready to admit defeat.

But Atwell wasn’t about to go down, so she called in backup.

And then, just to prove her superior firepower one more time, Atwell took a victory lap, with a little reference to Gregg’s wife, Dirty Dancing star Jennifer Grey, thrown in to twist the knife.

So, unless the SHIELD crew can find Tony Stark, consider this war over.