Here is my idea for Descendants 3.
A year after the events of the sequel, Mal and ben have graduated from high school and are ready to go to college. Though, tings turn upside down when Maleficent escapes from her prison, once she finds out a way to turn back to human. Mal must find a way to stop her and travels to the Isle to recruit some VKs that will need in order to defeat Maleficent. Uma appears and offers her help, which Mal accepts. Mal takes Uma, Harry, Gil, Freddie, daughter of Dr. Facilier, Scarlett, daughter of Scar and Hayden, son of Hades off the Isle. With Ben, Lonnie, Jane, Doug and Audrey, they travel to Forbidden Mountain and fights with her mother again. Meanwhile, Audrey tries to find her true love and asks Evie for advice. Evie tells her to follow her heart and everything will be fine. Mal beats Maleficent with Uma's help. They return to Auradon and they go to university all together.
- Dove Cameron as Mal, daughter of Maleficent.
- Mitchell Hope as 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, son of Cruella de Vil.
- China Anne McClain as Uma, daughter of Ursula.
- Thomas Doherty as Harry, son of Captain Hook.
- Dylan Playfair as Gil, son of Gaston.
- Maia Mitchell as Scarlett, daughter of Scar.
- Austin North as Hayden, son of Hades.
- Zendaya as Freddie, daughter of Dr. Facilier.
- Dianne Doan as Lonnie, daughter of Fa Mulan and Li Shang.
- Sarah Jeffrey as Audrey, daughter of Princess Aurora and Prince Phillip.
- Zachary Gibson as Doug, son of Dopey the Dwarf.
- Brenna D'Amico as Jane, daughter of The Fairy Godmother.
- Trevor Jackson as Prince Tyler, son of Princess Tiana and Prince Naveen.
- Kristin Chenoweth as Maleficent.
- Melanie Paxson as the Fairy Godmother.