Robert Downey Jr. challenges ‘Avengers’ co-stars in mustache contest

Robert Downey Jr. waged a battle of looks against some of his “Avengers” cast mates on Wednesday.

Robert Downey Jr. waged a battle of looks against some of his “Avengers” castmates on Wednesday.

The actor, who plays “Iron Man” in the series, unveiled the competition on Twitter and included a split image of himself, Mark Ruffalo and Chris Evans, each of whom were shown sporting mustaches.

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“Ok this time it's real—Who wore it best,” Downey Jr. captioned the photo, tagging his co-stars.

Ruffalo – the man behind the “Hulk” character – tweeted his own array of photos in response.

“I mustache...does quantity count? Or different kinds of mustaches?” he said. “I've seen quite a few unique styles over the years.”

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The photo montage had several photos of Ruffalo donning facial hair and also included a mustached “Hulk” cartoon.

There was no immediate Twitter reply from Evans, who plays “Captain America” in the films.