A medida que aumenta la tensión, las chicas conocen la verdadera naturaleza del mal. Además, Aria aprovecha la obra escolar para intentar acercarse a Ezra.

Spencer continúa cayendo en picada y desquita su rabia con Mona. Hanna planea reunir a Caleb con su padre, pero ¿no le saldrá el tiro por la culata?

It is prom time at Rosewood High School, except for Alison, Aria, Emily, Hanna and Spencer who have been banned due to "security" concerns. As the girls see this as the final humiliating blow to their high school careers, the girls' mothers try to make the best of a bad situation by offering a home prom in Spencer's barn. At first reluctant, the PLLs agree and try to make the best out of a bad situation. But one to never miss a formal, Charles has other plans in store to make this a night they will never forget.

Meanwhile, Veronica, Pam, Ashley and Ella use prom night to touch base on everything that has happened to their daughters.