It follows 8-year-old mermaid princess Ariel as she and her friends embark on fun-filled, action-packed underwater adventures throughout their Caribbean-inspired fairytale kingdom of Atlantica and beyond. The series features fan-favorite characters, including King Triton, Ursula, Sebastian, and Flounder, as well as exciting new additions like Ariel's two best friends, merchildren Lucia and Fernie, and lots of other adorable sea creatures.