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Descendants 3 - The Big Sleep is an upcoming Disney Channel Original Movie and the third and final installment in the Descendants trilogy. It was announced on February 16th, 2018, during the premiere of Zombies. The film is expected to be released in summer 2019.
In Descendants 3, the teenage daughters and sons of Disney’s most infamous villains (also known as the villain kids or VKs) — Mal (Dove Cameron), Evie (Sofia Carson), Carlos (Cameron Boyce) and Jay (Booboo Stewart) — return to the Isle of the Lost to recruit a new batch of villainous offspring to join them at Auradon Prep.
When a barrier breach jeopardizes the safety of Auradon during their departure off the Isle, Mal resolves to permanently close the barrier, fearing that nemeses Uma (China Anne McClain) and Hades (Cheyenne Jackson) will wreak vengeance on the kingdom. Despite her decision, an unfathomable dark force threatens the people of Auradon, and it’s up to Mal and the VKs to save everyone in their most epic battle yet.
- Dove Cameron as Mal, daughter of Maleficent.
- Mitchell Hope as King Ben, son of King Beast and Queen Belle.
- Sofia Carson as Evie, daughter of the Evil Queen.
- Booboo Stewart as Jay, son of Jafar.
- Cameron Boyce as Carlos De Vil, son of Cruella De Vil.
- China Anne McClain as Uma, daughter of Ursula.
- Sarah Jeffrey as Audrey, daughter of Aurora.
- Thomas Doherty as Harry Hook. son of Captain Hook.
- Dylan Playfair as Gil, son of Gaston.
- Brenna D'Amico as Jane, daughter of Fairy Godmother.
- Zachary Gibson as Doug, son of Dopey.
- Jedidiah Goodacre as Chad Charming, son of Cinderella and Prince Charming.
- Anna Cathcart as Dizzy Tremaine, daughter of Drizella Tremaine.
- Jadah Marie as Celia Facilier, daughter of Dr. Facilier.
- Christian Convery as Squeaky, son of Mr. Smee.
- Luke Roessler as Squirmy, son of Mr. Smee.
- Dan Payne as Beast 
- Keegan Connor Tracy as Belle 
- Melanie Paxson as Fairy Godmother 
- Judith Maxie as Queen Leah 
- While still in production, the movie was under the working title 'The Big Sleep'. 
- The rehearsals started on April 23, 2018. The movie started filming on May 22, 2018. The movie concluded filming on July 16, 2018.
- In the first teaser, the presence of Mal's father was hinted, so he may play a big role in the upcoming movie.
- All the actors, from the first movie to the sequel, are reprising their roles, with the exception of Dianne Doan.