Ariel's sister Aquata is having a birthday celebration. It's going to be a fun-filled day, complete with a special concert, and Ariel is excited about visiting her family. If only Prince Eric could go under the sea, too. At the party, Aquata wishes that Ariel could stay with them forever. At that very moment, a rare solar eclipse hits, and the wish comes true! Will Ariel ever be able to break the spell and return to Eric—and her life as a human?