There's a new "Avengers: Endgame" trailer as epic as you'd expect.

Although half of the Marvel universe is literally in the air after "Avengers: Infinity War," Robert Downey Jr. has a hairy question in his head.

The actor, who portrayed Iron Man, gathered "Avengers" co-stars Chris Evans and Mark Ruffalo for an epic fight of mustaches, as the victory over Thanos can wait.

"Ok, this time it really is," Downey Jr. tweeted on Wednesday along with a sub picture of himself, Ruffalo, and Evans, both of whom wore large facial hairs. "Who wore it best?"

Ruffalo, who brought the hulk to life on the big screen, pointed to the versatility of his facial hair that makes his "Avengers" partners green with envy.

Related: "Avengers: Endgame" recruited a familiar face to save the world in a new trailer: "Whatever it takes"

"I Mustache … counts the crowd "Or different types of mustache? I've seen a whole host of unique styles over the years," he tweeted on Wednesday, adding a crying, laughing emoji.

His tweet included a collage of nearly a dozen mustache-studded ruffalos.

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tell. Evans, aka Captain America, has not joined the party, but we're sure he'll do anything to win. If this reference was over your head, you should catch up on the new trailer "Avengers: Endgame" here.

"Avengers: Endgame" will be released on April 26th.

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