As Seth, Ryan, Marissa and Summer approach the end of senior year they prepare for their new lives in college and beyond. Before this Seth must confront his recent misdeeds or deal with the wrath of Sandy and the police. Ryan's proud mother arrives with a surprise for him. Marissa receives an astounding proposal that may radically change her plans. Summer, facing the prospect of going away without Seth, says her emotional farewells to her friends. Sandy shocks Kirsten by making a big decision after visiting his old Public Defender's office. Kaitlin returns and moves into Julie's home, vowing to become the next Cooper to rule The Harbor School. To Taylor's joy, the "core four" turns into the "fab five"; however, although the kids may be ready to move on to bright futures, unresolved issues from their past could ruin everything.