Scarlett Johansson - Scarlett Johansson Went Without Underwear To Keep Cool On The Avengers

The actress reprises her role as the Black Widow in the highly-anticipated blockbuster, which sees comic book characters including Iron Man, Thor and Captain America team up.

However, the star admits she and her co-stars were squirming uncomfortably during breaks because their restrictive superhero outfits left them sweating.

She tells Collider.com, "It's like 800 degrees in my costume... and it's a unitard, and I have nothing underneath it!

"I'd say everybody has their own uncomfortable costume situation. We all have our various things that we have to do to get comfortable.

"Everybody looks so uncomfortable until the cameras are rolling and then we all look slick. Then 'Cut!' and we're all like, 'Arrrgh... God, this thing, get it off me, it's awful!'"