Watch on SFlix. After Ariel, Moana, Tiana, Rapunzel, and Snow White thwarted Gaston's plan to take over all of their kingdoms, he calls upon Ursula, Jafar, and the Evil Queen to help take the Princesses down once and for all. The Princesses learn about Gaston's scheme and recruit a few friends of their own with the help of Magic Mirror: Aurora, Belle, and Cinderella! Together, the Princesses team up for an ultimate showdown of good versus evil.