An Intense Battle Of 'Avengers' Mustaches Is On Thanks To A Tweet From Robert Downey Jr

It looks like the Avengers are engaged in another civil war. But this, time, it's over facial hair.

Robert Downey Jr. is ready to settle the score in advance of the upcoming Avengers: Endgame, aka the event of the season.

The actor posted a picture of himself at a 2008 Iron Man press tour in Tokyo, with two other photos of his Avengers costars, Mark Ruffalo and Chris Evans, and asked: "who wore it best?"

On Wednesday, the 53-year-old action star tweeted:

"Ok this time it's real – Who wore it best, @ChrisEvans @MarkRuffalo?"

The thread exploded with fans weighing in with additional options from the MCU and beyond.

Some Tom Hiddleston fans wanted to poke fun of his idiosyncratic "invisible" 'stache twirling, but they kept the ribbing, Loki.

The Mark Ruffalo camp voted for their beastly hero. The actor's professional shots featured in the tweet were taken by photographer Jim Wright, according to E Online.

A magazine's poll favored Chris Evans with a mustache.

However, it seems most people prefer their Captain with smoother skin.

Chris Hemsworth was thrown in the mix, and looking damn FINE.

This list is just getting started, folks.

Some stan with Buckey Barnes, played by Sebastian Stan.

It Ant no competition with Paul Rudd.

We have our youngest entry in Tom Holland.

But our spidey sense is telling us he'll grow into his look.

How about Jeremy Renner? Anyone?

Who makes the rules, anyway?

There's nothing strange about Benedict Cumberbatch with facial hair.

The battle is not exclusive to one gender.

I think this really is their endgame.

But we have a winner. The granddaddy of all heroes. We stan with Stan Lee and his iconic mustache.

Get ready for Avengers: Endgame when it hits theaters on April 26.

To the biggest anticipated film – we must dash.