How the 'Descendants 3' cast became an 'extended family'

The stars and director of the "Descendants 3" speak out about how they have been there for each other in the wake of the unexpected death of their co-star, Cameron Boyce.
3:00 | 08/02/19

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Transcript for How the 'Descendants 3' cast became an 'extended family'
Now to our "Gma" cover story. The new "The descendants" movie is out today, and we have more of our interview with the cast and director revealing new details about the film and how they're remembering Cameron Boyce. T.J. Back with that. Reporter: "The descendants" had 22 million viewers. The sound tracks for these movies hit number one on the charts and sold 3.5 million Big deal. It's a big deal, George, and now it's the last chapter in the trilogy, and they have to do it without one of their closest friends and brightest stars. I'm the fairy godmother and The fairy godmother? Reporter: Adventure, fantasy. The Disney channel's musical saga, "The descendants," introduced us to the most iconic villains. Talk about world domination. Reporter: For the actors, it's also the end of an emotional era. I remember it wasn't even the last day of filming, but we were shooting the last scene, and I literally could not say the words. No. Literally couldn't say it. Reporter: The finale comes following the shocking death of 20-year-old co-star Cameron Boyce. We are your family too. We have been through a lot together. Reporter: Who or what over the past several weeks has helped you all through it? We have all just have really been there for each other. The cast or everybody who knew Cameron has come even closer and it's been a special thing. Reporter: Center stage for all three movies, four young actors, key to the franchise's massive success. How have your lives changed over the past five years? I have an extended family now. Reporter: The third and final chapter in "The descendants" universe is now here. To the core. I think that if we can leave our audience with this third film feeling this we have answered all their questions, and if we can leave them feeling closer to themselves through us, then that's success. The empowerment themes that you don't determine who someone is because of where they live, but you determine who someone is because of the choices they make in their life. Reporter: Do the times that we're living in -- Yes. Reporter: Did they have an influence on weaving the narrative that you have in the first, second and third film? Yes, and that Disney channel stood behind them. Reporter: Sofia Carson who plays the daughter of the evil queen from "Snow white," calls this the experience of a lifetime. The heart of this saga lies in its message. True power begins with love. Reporter: Now the Cameron Boyce foundation that they did found right after his passing, they're going to hold a tribute concert for Cameron and we'll see that a little later this month, and also they're dedicating tonight's premiere on Disney channel to Cameron Boyce and there's a tribute video, George, and I have seen that thing, and it will pull at your heart this evening.

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

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