'Star Wars: The Force Awakens' Cast on Training for Roles

Daisy Ridley, Oscar Isaac, John Boyega and Adam Driver talk about how they prepared for the new "Star Wars" film.
6:53 | 12/10/15

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Transcript for 'Star Wars: The Force Awakens' Cast on Training for Roles
Is it me or does it seem the world is waiting on the edge of its seat for the return of "Star wars"? They first took the galaxy by storm 38 years ago. And now they're back with a vengeance. And while much of the excitement is for the return of some of our favorite characters, there are some charismatic young stars who got to tango with the legendary space cowboy Harrison Ford. Here's ABC's Chris Connelly. Reporter: Breath-taking battles. Give it everything you got! Reporter: Bone-chilling bad guys. Dogfights. And droids. Plot details of "Star wars: The force awakens" remain under wrap. Yet while the seventh film in the "Star wars" series will bring back to the big screen such beloved figures as Luke, princess Leia, Han solo, chewbacca. The movie features two newcomers facing off against the dark side. I don't know your name. Finn. What's yours? I'm rey. Reporter: An ex-storm trooper named Finn and rey. She's really cool. Fy had a little sister I would be so pleased for her to see the character. Are we really doing this? Heroes for this new generation, played by two fresh-faced 23-year-olds from the UK. John boyega and dazely ridley. I'm shaking, this is insane. Reporter: Boyega looked at original "Star wars" auditions. You're on your own, I'll let your own, I'll let you off on the nearest system. You can't. We've come this far, we must find them. You talk about "Star wars" acting. In a Normal movie if you were am a ship, it was about to crash, the characters would call their family and tell them they love them and cry. In star wars it's like, whoo-hoo! We've done a lot of that. Reporter: Taking her own approach, ridley, for her first major film role made the choice not to pore over the earlier films at the outset. I'm really glad that I didn't know it that well because I didn't feel like I was trying to fit into anything. I was just trying to do a good job. Reporter: Joined by Adam driver playing dark side demon kylo ren with the much buzzed about light saber. The first time they've been able to actually put light in it where it reflects two people's faces and do special effects and 3D print, the whole thing armed with lights and special effects, it's pretty heavy. Reporter: A whiz bang pilot, accomplished actors, with memories of "Star wars" from childhood. This is crazy, look around. What was your first experience of a "Star wars" film? "Return of the jedi." Really the moment when darth vader's helmet comes off is what I remember. It stuck with me very much. It was such a weird, sad man underneath that. You were right about me. It will be like when his helmet will come off. My dad had a storm trooper helmet H helmet he'd chase us around the house with. Terrifying. That's great. That's great. Trying to make us cry. I punched him in the nose one time, he was very proud of me. So that's how I was exposed to it, through pain and misery. Reporter: "The force awakens" begins 30 years after "Return of the jedi" with rey compelled to caf vage on an arid planet. She has no family, she has no friends. For someone to maintain a hope within that is a wonderful then. Camera, action! Reporter: Guidance occasionally from J.J. Abrams, stepping into George Lucas' shoes, but from the on the set presence and involvement from the original cast. This is the real thing. We're actually doing it. That's chewbacca, that's peter Mayhew, that's Anthony Daniels, that's Harrison, Carrie, mark -- I think that for me made it feel -- that's what made it feel very real. You might need this. I think I can handle myself. Did you sit in Harrison Ford's seat? I did. I piloted "The falcon." I went to step into it and he's like," that's mine." It wasn't funny, it was really embarrassing. J.j. Is like, oh my god. But he was gracious. He offered to teach me a little bit. He did say, remember, it's in space. Like I didn't know what I was doing, just flipping switching and pretending. Reporter: Less pretending called for on "The force awakens" with Abrahams emphasizing so-called practical effects over computer-generated imagery, the real thing. Such as the film's new droid bb8. Are we really doing this? Bb8, hold on. Yeah, whatever, mate. I didn't do that. Shut up. I can say that bb8 is the first kind of real relationship that rey has had in a long time. And it's so pure. It's wonderful. When it came to humans I was probably intimidated. Like oh my gosh, can I go back to the droid? Reporter: For its two young leads the chance to see the finished film well before it's December 18th American release date was huge. We sat around together for an hour. On the car on the way to the airport I cried a lot. I didn't know why I was crying. It was a very odd out of body kind of experience. It was fantastic. I think I'm great in it. Oh, gosh. I think I head somewhere you've been cuddling your dog and baking cakes to keep from going out and having to say what happens in "Star wars"? That's my life. I don't do that to stop the rest of my life, that is my life. Reporter: Perhaps not for much longer. Stardom may beckon after the world gets to see these two in action wearing their "Force awakens" wardrobe. You'll never see this costume clean because of the stuff that happens when I'm wearing it. How did they let you know you were going to wear that beautiful number? We tried a couple combinations. When we got to the desert, obviously it's designed for the desert, it just felt perfect. It fits to the atmosphere so well. Reporter: The atmosphere had temperatures that soared to 120 degrees, leaving these two grateful for the physical training they endured. We were both so relieved. When we got to Abu Dhabi we had to run so much. Without the preparation, we would have -- John, daisy, again, faster? Faster, mere intense? More enintense? Reporter: For "Nightline" I'm Chris Connelly in Los Angeles. "Star wars: The force awakens" is produced by a division of ABC's parent

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

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