Twenty years ago, the United States of Auradon banished all villains to a forbidden island called 'The Isle of the Lost.' There on that island is Helena, the daughter of Hades. This mysterious, sarcastic, and manipulative girl spends half of her time down in the Underworld and other half on the Isle, where Pain and Panic take care of her.
But she isn't alone on the Isle. Helena is "friends" with Mal, the daughter of Maleficent; Evie, the daughter of the Evil Queen; Jay, the son of Jafar; and Carlos, the son of Cruella de Vil. On the Isle, these five teens rule supreme and cause nothing but mischief and mayhem.
Meanwhile in Auradon, the benevolent teenaged son of King Beast and Queen Belle is poised to take the throne. His first proclamation, offer a chance of redemption to the trouble-making offspring of Hades, Maleficent, the Evil Queen, Jafar, and Cruella de Vil. These children are allowed into the idyllic kingdom to attend a prep school along the children of other heroes.
It's in this land that these five villainous children discover the difference between who people think they are and what they can be. But will they be happy with who they truly are or will they change in order to please everyone else?