Synopsis from E! online
When the pressure to be royally perfect becomes too much for Mal, she returns to her rotten roots on the Isle of the Lost where her archenemy Uma, the daughter of Ursula, has taken her spot as self-proclaimed queen of the run-down town,“ the description continues. "Uma, still resentful over not being selected by Ben to go to Auradon Prep with the other Villain Kids, stirs her pirate gang—including Captain Hook’s son Harry and Gaston’s son Gil—to break the barrier between the Isle of the Lost and Auradon, and unleash all the villains imprisoned on the Isle, once and for all.”
……Director Kenny Ortega tells E! News exclusively, “When Ben realizes Mal has left Auradon, he decides to go after her. Mal’s friends—Carlos, Evie and Jay—decide to go with him to help, but first they have to teach him their wicked ways so he can sneak around the Isle of the Lost without being recognized.”
As E! News revealed last month, Captain Hook’s son Harry is being played by Scotland native Thomas Doherty
. He’ll be joined by fellow newcomers China Anne McClain
as Ursula’s daughter Uma, Dylan Playfair
as Gaston’s son Gil, and Anna Cathcart
as Drizella’s daughter Dizzy.
So far no word of how CJ & Freddie - who is apparently going to be voiced by China's sister in the upcoming season now - as well as book characters like Harriet & The Gaston Twins will fit into the canon.