The holidays are just around the corner and the friendly inhabitants of Bubbletown are on a mission to have the grandest time under the sea! While besties Jojo and Delfi are working to give everybody in town the most amazing gift, little hatchlings Muggles and Joy discover their pal Delfi and her family are planning to leave town for the holidays! Meanwhile mayor Patty has a problem: the town's Christmas coral tree is missing! Enter mystery-solving Inspector Shark McToothy and his tag-along helper Happy Harry the crab who are determined to solve the riddle of the missing coral tree! That is, until wise Grandma Harriet comes to the rescue with a tip for the inspector and a good dose of wisdom for little buddies Jojo and Delfi! But will Muggles and Joy convince Delfi to stay in town for the holidays? Dive in with the Bubbletown crew in Under The Sea 2!