The Flipside Formal offers Emma the chance to try and trap Rebecca and Sutton in a lie, but she needs Ethan's help to pull it off. Laurel struggles with where her loyalties lie, while Kristin makes a troubling discovery that has more significance than she realizes. Jordan continues to waffle between Laurel and Mads, and Theresa's defense of Alec threatens to drive a wedge between her and Dan. Meanwhile, Rebecca and Ted, and Alec and Kristin, each reminisce about old times.