Princess Evie is crazy about her ponies. But Princess Evie's ponies aren't like any other ponies - oh no! Her ponies are magic ponies and, whenever Princess Evie rides them, she is whisked away on a magical adventure in a faraway land . . . In this adventure, Princess Evie and Sparkles, the kitten, are whisked away on the back of Neptune the pony to an undersea world where they help a mermaid to find her special pink pearl - just in time for the Mermaid Queen's Parade!