Dottimar returns to the sunken sea kingdom and desperately tries to awaken her son, rainbow dragon, Cathoundral, who has been enchanted by Orange Faery. Ancient faery Verimetus and her grand-daughter, Blue Lantern faery, Vermial, lead Triton, the dragons and the merfolk into the Abyss in an attempt to find Triton's missing daughter, Princess Sirena Mirashal.