Scarlett Johansson has revealed it was "like big kids at Halloween" the first time she and her Avengers Assemble co-stars met on set.
The actress was joined at the movie's LA premiere by co-stars Chris Hemsworth, Robert Downey Jr, Jeremy Renner, Tom Hiddleston and Samuel L Jackson.
And Scarlett - who plays the Black Widow - told Access Hollywood "it was mayhem" when the A-List cast appeared on set in their superhero costumes.
The 27-year-old, wearing a knee-length, peplum-waisted black Versace dress, added: "It was like big kids at Halloween, all of us were like, 'Is this really happening? This is really surreal, like I saw you in hair and make-up this morning and now you're in a giant latex unitard. What's going on?'"
When asked which superhero she found sexiest, Scarlett confessed: "I have to say Sam Jackson as Nick Fury is pretty fantastic, that eye patch and that big cape. The man is top class."