Do YOU believe in mermaids? You will -- when you set sail on a magical full-length adventure under the sea with SOFIA THE FIRST! After Sofia helps a little mermaid named Oona, Sofia's amulet grants her the power to transform into a mermaid and visit her new friend's secret underwater kingdom. But when Cedric (disguised as a sea monster: plots to steal Oona's enchanted Mermaid Comb, danger surfaces for both worlds. With a little help from special guest Princess Ariel, Sofia embarks on an adventure to rescue Oona and prevent a typhoon before it's too late. Overflowing with oceans of song-filled fun -- plus three more exciting episodes -- THE FLOATING PALACE proves that when families and friends work together, they can weather any storm and save the day!