Viggo Mortensen talks starring along Mahershala Ali in the 'Green Book'

The star of the new blockbuster hit discusses how he got into character and what fans can expect from the film, live on "GMA."
3:23 | 12/27/18

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Transcript for Viggo Mortensen talks starring along Mahershala Ali in the 'Green Book'
Reporter: It's not just the holiday season, but it's movie season, and one blockbuster getting a lot of buzz is the powerful film based on a true story called "Green book," and you got to sit down with one of the stars, viggo Mortensen. Yes. He's a Hollywood veteran and ritt literary aficionado. He told me that "Green book" is one of the best scripts he has read in his 30-year career. Reporter: Viggo Mortensen taking an audience on a road trip. It's past the limits of your first impression of somebody. That's for anybody you meet. Reporter: It's a journey based on a true story. Mortensen plays a streetwise bouncer hired to protect Dr. Don Shirley. I'm about to embark on a concert tour down south. Atlantic City? No. The deep south. He is a great artist who could be playing Europe, concert hall cathedral. But he chooses to go down south where he will be treated like dirt. He realizes that what don is doing is, like, a nonviolent protest. Reporter: And the title of the movie, "Green book," is based on a guide. The guide from the mid '30s to the mid '60s. White people would have the places you can stay. The Negro owner's green book was there was not many places you can stay, and here's where you can stay so you don't get beat up or worse. My wife went out and bought one of your records. About the orphans. Orfius. Those weren't chish on the cover. These. Reporter: Demons in the bowls of hell. Reporter: Central to the story are the people from two different backgrounds who form a close friendship. It's funny. It's a great buddy movie, like, a road trip, but they are also going to get something really profound. You can't help but thinking about the times we're living in and the value of communicating, of listening to each other rather that just yelling and each standing in their corner which is what's happening. Reporter: The film has a lot of people talking and multiple award nominations. "Green book." "Green book." "Green book." Reporter: How do you feel now that there is so much Oscar buzz around it already? All it says to me is well, there are a certain amount of people like our movie. That's all that means. It must mean a lot of people like your movie. Yeah, and that's great, but it could happen. It might not happen. If it doesn't, it's not going to change one little bit how I feel about this movie. I think this is one of those rare movies that you could watch a year from now, five years, ten years from now and not just make them laugh and cry and have a great time, but they will come out of the theater hopeful. Oh, the world needs hope right now. That is for sure. Viggo breathed a sigh of relief and the real life family of Tony embraced him. He wanted to make sure he was authentic to the character. That is in theaters right now. You have been making the celebrity rounds. All sorts of movies. We have to get to the movies. Part of a holiday tradition.

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

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