Keira Knightley, Benedict Cumberbatch Star in 'The Imitation Game'

The actors talk about portraying the story of cryptanalyst Alan Turing during WWII.
3:57 | 11/25/14

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Transcript for Keira Knightley, Benedict Cumberbatch Star in 'The Imitation Game'
. Our parent company, Disney, and committed to helping create healthier generations and giving $ 1 million to feeding America to provide nutritious meals to kids after school. And now "The imitation game with the, telling the story about the cracking of the German enigma word in world war ii. The cast joins up. It's a bright mathematician who has trouble fitting in with his peers. Take a look. I have asked if you want to come to lunch with us. No, you didn't, you said you were going to get some lunch. Have I offended you in some way? No. Would you like to come to lunch. What time is lunch. It's a bleeding sandwich. I don't like sandwiches. Bril atlantay played. And Benedict, as you remember playing Allen, did you have something you wanted audiences to take away? A lot. He was somebody we cared about getting the legacy right. He's somebody who deserves a far bigger place in our culture and our history than he's been afforded as both an extraordinary scientific mind and philosopher. The man behind modern computing science. And Keira, you play Joan, the lone woman in the sea of men, much like the cast. I can't imagine what it was like. I can't imagine what it was like either. Must have been really odd. And the relationship between Joan and Allen was beautiful. Did you do a lot of historic research on who Joan was? She was an incredible woman. The fact there was a woman at the center of breaking the E nick ma code was extraordinary in and of itself. You have called this a movie about outsiders, and the importance of being different. What did you hope to achieve? This is a movie that celebrates those who are different. Not burdened down by normality. This is the forefather of the computer. Who, you know, shortened a war and saved millions of lives. Charles, I know that you play the tough commander in the imitation game, and a star of one my favorite TV shows, might have heard of it, "Game of thrones." Last season we thought you were done. But we might see tyrion LAN stir? Season five? Yeah, I wake up in the shower having a terribly bad dream. Might is the operative word. More than that I cannot say. You and Allen, for the Downton abbey fans, you are in the next season. We here in the states -- I don't believe I can work without him now. It's in the contracts. It's known as the Matthew good clause in my contract. Has to be there at least five days of filming a year. Sucks to be you. And then I know, Matthew, you play the youngest member of the group. Yes. What was it like for you filming? Well, it was easy to relate to a young guy who's just at university and just learning his field. So as a young, inexperienced actor, it was quite easy to relate to. We have one social media question. Heather on instagram wants to know, is it ever intimidating taking on a movie based on real events? It's difficult when you're making a film about something because you have to judge the documentary element. You want to do it justice. But drama demands something uchb often a little more interesting than real life. Balances the issue. It was a fantastic film. Everyone should see it. "The imitation game" opens in theaters this Friday.

This transcript has been automatically generated and may not be 100% accurate.

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