When a new crime-fighting horse arrives in Corona, it doesn't take long for Maximus to realize his new stablemate didn't come to town to make nice.
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.