After learning the reason behind Cassandra's betrayal, Rapunzel returns to Corona only to find it taken over by one of her most dangerous enemies.
Six months after escaping Mother Gothel and reuniting with her birth parents, King Frederic and Queen Arianna of Corona, Princess Rapunzel is unable to properly adjust due to her father's constant protection. When she and her handmaiden Cassandra sneak out of the castle, they come upon some magical black rock spikes that magically restores Rapunzel's long blonde hair as they, Eugene Fitzherbert, Pascal the chameleon, Maximus the horse and young alchemist Varian uncover the mystery of her hair's return and its connection to the black rocks growing around Corona. Eventually, Rapunzel learns that Sundrop Flower's power resides in her with the black rocks directing her to the Dark Kingdom.