[5] Mal struggles with her new celebrity life as the girlfriend of King Ben, putting a spell on her hair making it blonde, and uncomfortably maintaining a princess-like personality.

Mal returns to the Isle of the Lost, now ruled by her former rival Uma, Ursula's daughter, along with Harry and Gil, the sons of Captain Hook and Gaston.

Mal visits hairstylist Dizzy Tremaine, Drizella's daughter, who restores her signature purple hair.

Ben, Evie, Jay, and Carlos learn of Mal's departure so sneak onto the Isle to find her, but Gil recognizes them.

Uma then orders Mal and her friends to retrieve the Fairy Godmother's wand in exchange for Ben's safe return.

They are caught by Lonnie, Mulan's daughter, who blackmails them into letting her come, having previously been rejected from Jay's sports team based on her gender.

Aboard a ship during the Cotillion, Ben stuns everyone by appearing with Uma, who he declares as his true love and announces he will destroy the barrier on the Isle.

Jane unveils a stained glass display Ben commissioned to show his affection for Mal, who realizes he loved her for who she was all along.

Enraged, Uma leaps into the water using Ursula's magic seashell necklace to transform into a cecaelia, and Mal fights back as a dragon.

[13] According to China Anne McClain, the post-credits scene featuring Uma saying to the public that "You didn’t think this was the end of the story?"

[6] On July 19, 2017, it was announced on The View that Whoopi Goldberg would be providing the voice for Ursula, the Sea Witch and Uma's mother.

[25] On Disney Channel, the film was watched by 5.33 million viewers, and topped the night on cable television, receiving a 1.20 rating.

The main plot details Uma planning to get the migrating trident of King Triton in order to help bring down the barrier surrounding the Isle of the Lost.

Serpent Prep is a rival of Dragon Hall, where Mal, Jay, Carlos, Gil, and eventually Evie were educated.

Other information listed here that was later referenced in the film was Audrey and Chad breaking up, the introduction of R.O.A.R., Mal keeping Maleficent's lizard form as a pet, and Evie having her magic mirror placed in the museum.