Angelina and her friends love the new student in their dance class, a hip-hop dancing mouse named A.Z., but when it is time to partner up for the ballet, everyone wonders if A.Z. will have what it takes to keep up.
After a series of mishaps involving a cake, decorations, and their present, Angelina and her friends still manage to pull off a surprise birthday party for their ballet teacher, Ms. Mimi.