Scarlett Johansson has revealed that Black Widow and Captain America form and 'unexpected friendship' in Captain America: The Winter Soldier.
Johansson is set to reprise the role of Black Widow in the second Captain America movie as she reunites with Chris Evans.
Evans is back in the title role, as he teams up with Johansson for the first time since Avengers Assemble.
They, along with the cast and director's, were at Comic Con over the weekend to talk about the upcoming movie.
Speaking at Comic Con the actress said: "Their working relationship becomes a more intimate friendship.
"They have some unexpected similarities - they both have their guard up, they have trust issues, and they've also both been working for 'the man' for their entire career.
"Through this unexpected friendship that forms, they both start to question what they want."
Samuel L. Jackson, Cobie Smulders and Sebastian Stan are all returning, while Emily VanCamp, Robert Redford and Anthony Mackie are some of the new faces to watch out for.
The movie is set after events of Avengers Assemble and follows Steve Rodgers as he tries to find his place in a 21st Century world.
Captain America: The Winter Soldier is released 2nd May 2014.