Anthony Mackie has said the movie about the story of Wikileaks is an "important and relevant" drama.
Captain America action man Anthony plays Sam Coulson in The Fifth Estate, which stars a blonde Benedict Cumberbatch as Julian Assange and new Doctor Who Peter Capaldi as Guardian editor Alan Rusbridger.
Speaking at the Disney Expo event in California, Anthony said he couldn't wait for audiences to see the thriller.
"It was great, it was always a dream of mine to work with Bill Condon (the director), I've known him forever and the movie turned out really well."
The film is set to premiere at the Toronto Film Festival in September before going on general release in the UK on October 11.
Anthony added: "It's a story that is very important and relevant right now in our society and I'm excited for people to see it, it's a really thought-provoking drama in the likes of The Insider."
The Insider starred Russell Crowed and Al Pacino and was about a research chemist who came under attack when he exposed Big Tobacco on national television.