A young mermaid makes a deal with a sea witch, to trade her beautiful voice for human legs so she can discover the world above water and impress a prince.

A witch tasks a childless baker and his wife with procuring magical items from classic fairy tales to reverse the curse put on their family tree.

A few decades after her original visit, Mary Poppins, the magical nanny, returns to help the Banks siblings and Michael's children through a difficult time in their lives.