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The fondest of farewells; what happens to the Cohens, the Coopers, Ryan and Taylor.

The O.C.

The End's Not Near, It's Here

The gang struggles to make sure everyone is OK after the earthquake hits; Seth does whatever it takes to be with Ryan and Taylor; Taylor finds out that family bonds are greater than she thinks; the Coopers are in an ice-cream shop.

The Night Moves

Ryan and Taylor share some special words; Kaitlin decides to sabotage Frank and Julie's relationship; Kirsten realizes what Newport society is all about; Summer encourages Seth to find something about which to be passionate.

The Shake-Up

Julie has a plan to make things right between Ryan and his dad; Julie continues to move things forward with Bullit; after they get a psychic reading, Summer wonders if she and Seth are right for each other.

The Case of the Franks

Kirsten gets news that will change her life forever; Julie has a secret love affair; a therapist gives Taylor rules by which to live; Che discovers that Seth is not his soul mate.

The Groundhog Day

Che and Seth take a trip to the forest; Seth and Summer speak; Taylor decides that she can no longer speak to Ryan; Julie works her way back into Kirsten's life; Kaitlin shuts Will out.

The Dream Lover

Taylor's ex-husband gets a little too close to home while promoting his memoir; Seth asks Dr. Roberts for permission to marry Summer; Kaitlin realizes that she likes Will.

The French Connection

Kaitlin fails a class presentation and must work with Will; Seth and Summer move forward with their plans; Julie tells Kirsten of Frank's true identity.

The My Two Dads

Summer ruins Ryan's romantic getaway plans; Summer's future rests in the hands of a raver the gang meets on the way to Las Vegas.

The Earth Girls Are Easy

Ryan and Taylor realize that everything is not as it seems after they have an accident hanging holiday lights.

The Chrismukk-huh?

Seth finds an empty dorm room when he visits Summer at Brown; Sandy and Kirsten find an opportunity to bond with Ryan, who is in a Taylor-induced haze; Julie learns that Newmatch is more than a dating service.

The Summer Bummer

Taylor comes up with a therapeutic plan to help Ryan get over his insomnia; Summer and Che take their activism to a new level at Brown, resulting in more freedom than they expect; Kaitlin helps save the dating service.

The Sleeping Beauty

A troubled young man makes waves in a wealthy, harbor-front community.

S4 E16 | The End's Not Near, It's Here

E16 | The End's Not Near, It's Here

E15 | The Night Moves

E14 | The Shake-Up

E13 | The Case of the Franks

E12 | The Groundhog Day

E11 | The Dream Lover

E10 | The French Connection

E9 | The My Two Dads

E8 | The Earth Girls Are Easy

E7 | The Chrismukk-huh?

E6 | The Summer Bummer

E5 | The Sleeping Beauty