Ariel and Eric have had a baby daughter, Melody, but the threat of reprisal from Ursula's sister Morgana means that they must keep the girl in the dark about her mermaid heritage. However, to be a mermaid is what Melody wants most and her dreams of the sea soon find her playing into the evil Morgana's hands. To set things right, Ariel must team up with her old chums Sebastian, Flounder and Scuttle and embark upon a daring rescue mission.

Animated sequel following aging turtle Sammy as he is swept away on an adventure to Dubai. When Sammy and his lifelong friend Ray are caught by poachers they find themselves destined to become part of an aquarium display in Dubai. As the duo plan an escape, along with their new acquaintances which include a blob fish, a lobster, an octopus and a group of penguins, their young grandchildren Ricky and Ella go off on an adventure of their own in an effort to save their grandpas.