When an old nemesis returns to Newport, Ryan gets caught up in helping her, causing a rift between him and Sadie (recurring guest star NIKKI REED). Seth and Summer are faced with a new problem that Taylor (recurring guest star AUTUMN REESER) tries to solve. Meanwhile, Marissa finds herself all alone in Newport with no one to turn to, and Sandy grapples with business pressure.

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Ryan struggles with the decision of whether or not to invite Marissa to his birthday party, and Sandy wants to include one of Ryan's relatives in the celebration. Meanwhile, Julie and Dr. Roberts (recurring guest star MICHAEL NOURI) come clean with Summer and Marissa. Also, Ryan and Sadie (recurring guest star NIKKI REED), along with fellow new couple Marissa and Volchok (recurring guest star CAM GIGANDET), grow closer.

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Sadie (recurring guest star NIKKI REED) and Ryan go on a road trip to find one of Johnny's relatives. Although Ryan returns to his old "Chino" ways, the trip brings him and Sadie closer. Could this mean the end of Ryan and Marissa's relationship? Meanwhile, Marissa is implicated in Johnny's death, and Seth and Summer discover Julie and Dr. Roberts' (recurring guest star MICHAEL NOURI) secret. Musician TOM VEK performs.

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Tragic news forces the friends to sort out their problems and face the reality of the situation. After Johnny's cousin, Sadie Campbell (recurring guest star NIKKI REED), arrives in Newport, Ryan helps her move and get rid of Volchok (recurring guest star CAM GIGANDET), causing Ryan to question his and Marissa's relationship. Meanwhile, Kaitlin's (recurring guest star WILLA HOLLAND) winter break is over. Just as she gets close to her family, she once again has to say goodbye. And in the wake of Newport's latest events, Kirsten and Julie press on with their Valentine's Day party.

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Summer discovers the truth about Seth. Sandy and Matt (recurring guest star JEFF HEPHNER) encounter an obstacle to their hospital project. Kirsten and Julie take their matchmaking business a little too far, causing Julie to go into hiding. Marissa finally tells Johnny (recurring guest star RYAN DONOWHO) how she truly feels. And Kaitlin (recurring guest star WILLA HOLLAND) wonders which Cooper Johnny really likes.

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While Marissa does all she can to get to know her sister again, Kaitlin (recurring guest star WILLA HOLLAND) just stirs up trouble for the gang as she prepares to celebrate her birthday. Meanwhile, Sandy encourages Seth about college, but Seth finds a better alternative. Sandy and Matt (recurring guest star JEFF HEPHNER) work together to secure a contract for the new hospital. And Julie continues her quest to put her family back together.

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Fourteen-year-old Kaitlin Cooper (recurring guest star WILLA HOLLAND) returns to Orange County during her winter break from an exclusive Montecito boarding school--bringing a lot of attitude and a few secrets. Much more in the mold of her mother, Julie, than her sister, Marissa, Kaitlin turns heads as she tries to get closer to her family in the only way she knows how.

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