Pandora, Seabold, Whistler, Lila, and Tiny have all been enjoying the love and comfort that being a family brings. It is a comfort they are unexpectedly reminded of when Whistler and Lila hear the cries of a lonely baby beluga whale named Sebastian. When they learn that he has lost his mama, the Lighthouse Family, with the help of a cranky but noble old cormorant named Huck, does all it can to bring Sebastian and his mother together again.