Transcript for Will Ferrell and Julia Louis-Dreyfus head 'Downhill' in new film
That's nacho cheese. Now to a powerhouse comedy duo, Julia Louis Dreyfus and will Ferrell teaming up in the movie "Downhill," playing a couple that is going in that same direction. "Downhill." The movie debuting at sundance over the weekend, and will reeve is so far away right now, but he sat down with them at the film festival in park city. Hi, guys. I met up with them at sundance. I hitched a ride on a gondola-type contraption. The marital strife that exists between the two icons in "Downhill," lots of fun adoration in real life. Take a look. Reporter: They're two of the biggest names in comedy, Julia Louis Dreyfus and will Ferrell. Maybe we ski the beast after lunch. Reporter: And for the first time ever, they're teaming up and hitting slopes in the new film, "Downhill." Beautiful scaffolding there. It's lovely. A construction center. They're building it. Did you know this is where you wanted the movie to premiere? We talked about this would be an ideal spot, but of course, you have to be invited. There's always that chance they might not, you know? Obviously we -- we screened it for them, and fortunately we got the invitation. Reporter: Will and Julia pay Pete and Billie, a married couple on what seems like a dream family vacation in the Austrian alps, but on the mountain, an avalanche heads straight for them, and Pete abandons his family. Once the snow settles, the tension remains. You're so likable, but your character in a lot of ways is not. What was that experience like for you? Pete's a jerk. Pete's a jerk, but at the same time I think there's a certain vulnerability you find in Pete, and I think depending on what side of the coin you're on, you're almost sympathetic to him in a way. What drew you to this project? What drew me to the project was sort of the essence of the story which is the notion that you might be viewing reality one way through a certain lens, and that that lens is pulled off, and all of a sudden you're looking at reality a completely different way. What did it take to get you on board. It took a lot. Yep. That's where most of the budget went, right? Yep. Pretty much. 80% of the budget. I was presented the script, and sat down with Julia which was the first time we ever met. Really? Yeah. You would never know that in the movie there's such chemistry. We're still baffled by it. How is that? I don't know. You're, like, the titans and icons of your generation. That's what we said. We were literally saying those words. Reporter: Zach woods and Zoe chow play the children. Rosie, can you run in ski boots? Not very well. Boom. Exactly. What was your experience like entering this world with will and Julia? It was -- it was wonderful, but it was also strange because these guys are role models and heroes of mine creatively. That's . Their characters are bleeding out. It's a weird combination where I keep looking at people who I admire creatively, and feeling protective and sorry for them. It's a sort of strange collision of emotions. I mean, it really felt like so charged and all we really had to do was listen to, like, them struggle so much. I don't do that as an actor. The reactions when we showed the film to people, you know, some people are sort of laughing because they're so uncomfortable and they don't know how to digest this emotion that's happening in the film. These two, their characters are us, like, the audience. We're sitting with them in that awkwardness, and without them, it's not as -- it's not -- you wouldn't have that feeling. Who would do the best and the worst in the scenario with the avalanche coming down? Who's going to be the hero? Who's running? Julia. Snow. I will take care of him. I'll take care of everyone. I'll just grab y'all. I got it. Julia also took care of everyone by producing "Downhill," and the movie premieres nationwide February 14th, Valentine's day. Julia will also be here in studio to tell us more. That's a lot of fun. I can't wait to have them here in the stustudio.
This transcript has been automatically generated and may not be 100% accurate.