Cady Heron (Lindsay Lohan)’s Timeline and Summary
- After being homeschooled in Africa for her entire life, Cady starts her junior year at North Shore High School.
- Cady's befriended by Janis and Damian.
- The Plastics invite Cady to eat lunch with them every day.
- Cady goes undercover and hangs out with The Plastics, reporting back to Janis and Damian about how awful they are.
- The Plastics show Cady their Burn Book, a scrapbook that degrades their fellow junior girls.
- Regina gives Cady her blessing to pursue her ex-boyfriend, Aaron.
- Regina kisses Aaron in front of Cady on Halloween.
- Cady, Janis, and Damian hatch a plan to destroy Regina's life.
- Cady starts failing calculus on purpose so Aaron will tutor her.
- Cady tells Aaron that Regina's cheating on him, and they break up.
- When Ms. Norbury confronts Cady about tanking math for some dude, she adds Ms. Norbury to the Burn Book.
- Using a three-way call attack, Cady turns Gretchen and Karen against Regina.
- Instead of going to Janis's art show, Cady throws a house party while her parents are away. Janis and Damian show up after the show, and Janis rips into Cady.
- Regina shares the Burn Book with the entire school and tries to frame Cady, Gretchen, and Karen for it.
- The junior girls are forced to have a "stop being awful" workshop. Janis tells everybody about she and Cady's plan to ruin Regina's life.
- Regina storms out of the workshop, and Cady follows. Regina's in the middle of telling Cady off when she gets hit by a bus.
- Cady takes the blame for the book, even though she didn't make it.
- Ms. Norbury makes Cady join Mathletes.
- Now that she's no longer Plastic, Cady and Aaron make up.
- Cady is crowned Spring Fling Queen and shares her crown with all the junior girls.
- Fast-forward to senior year: Cady, Janis, Damian, and The Plastics aren't BFFs, but they are all getting along.