Elle goes to her first day of law school and sees her ex-boyfriend Warner in the hallway. He is surprised to see her and is dumbfounded that she got into Harvard Law as a student.
Cady meets The Plastics at lunch, and they are incredulous at some of her experiences. They invite her to have lunch with them every day for the rest of the week.
Five high school students, all from different stereotypes (brainiac, athlete, basket case, princess, and criminal) report to detention on a Saturday. The narrator indicates that these stereotypes don't truly reflect who the students are and are merely "convenient definitions" of them.
Bianca Piper, a high school senior, tells her crush that she likes him, only to learn that he recently got back together with his girlfriend. When his girlfriend sees her, she threatens to release a video about her. Bianca stands up to her and gives her an empowering speech on self-image.