The O.C.

S4:E1 The Avengers

High school seems like a distant memory to the graduates of Harbor School in the ocean-side community of Newport Beach in Orange County, California.

S4:E2 The Gringos

Ryan travels to Mexico with Seth in tow to put an end to his turmoil in the only way he knows how, but he comes up empty in his quest for revenge.

S4:E3 The Cold Turkey

It's Thanksgiving morning at the Cohen house, and the family is still dealing with what happened in Mexico.

S4:E4 The Metamorphosis

When Summer tries to become the gossip-loving girl she once was, she realizes Brown may have changed her forever. Seth continues to be supportive.

S4:E5 The Sleeping Beauty

Summer and Che take their activism to a new level. After Julie flirts with a tennis instructor whom Kaitlin likes, but she gets revenge at a party.

S4:E6 The Summer Bummer

When Seth visits Summer at Brown, he finds an empty dorm room. Sandy and Kirsten take advantage of an opportunity to bond with Ryan.

S4:E7 The Chrismukk-Huh?

It's time for Chrismukkah in the OC. After Ryan and Taylor have an accident while hanging holiday lights, they realize everything is not as it seems.

S4:E8 The Earth Girls Are Easy

Ryan plans a surprise road trip for Taylor and himself. When Summer confronts Seth about not making plans, Ryan's romantic getaway is spoiled.

S4:E9 The My Two Dads

Newly engaged Seth and Summer both panic about the prospect of being married, but neither will break it off, despite the advice of their friends.

S4:E10 The French Connection

Henri-Michel gets too close to home while promoting his memoirs. After Henri-Michel tells Ryan about Taylor's life, Ryan questions his relationship.

S4:E11 The Dream Lover

Che and Seth take a trip to a forest, where Che has a dream and discovers his spirit might be in love with someone unexpected.

S4:E12 The Groundhog Day

As the Cohens prepare for Kirsten's birthday party, Kirsten gets news that will change her life.

S4:E13 The Case of the Franks

As Valentine's Day approaches, Ryan worries the pressure will ruin his relationship with Taylor.

S4:E14 The Shake-Up

Taylor prepares for her birthday celebration but frets over the fact Ryan has still not told her that he loves her.

S4:E15 The Night Moves

A major earthquake cuts off power and communication between the Cohens and their loved ones.

S4:E16 The End's Not Near It's Here

The Coopers and their friends build new lives, resolve lingering issues, face major decisions and undergo shocking personal transformations.