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The lives of a group of friends and families...

The lives of a group of friends and families have forever been changed by the arrival of an outsider to their affluent ocean-side community of Newport Beach in Orange County, California. When Ryan Atwood (series star BEN McKENZIE) was taken in from the streets of Chino by then public defender Sandy Cohen (series star PETER GALLAGHER), the Cohens had no idea how Ryan's arrival would change their lives and the lives of those around them. Initially resistant, Kirsten Cohen (series star KELLY ROWA

Chaos reigns in the Cohen kitchen as Sandy,...

Chaos reigns in the Cohen kitchen as Sandy, Ryan and Seth continue to cope with Kirsten's rehab. When Sandy encourages Kirsten to come home to her family, Kirsten's attachment to Charlotte (recurring guest star JERI RYAN) raises concern in Sandy. Meanwhile, at The Harbor School, Dean Hess (recurring guest star ERIC MABIUS - "Eyes"), the new Dean of Discipline, arrives and makes a decision that changes Marissa's life forever. Summer trumps her cardigan-wearing, goody two-shoes nemesis Taylor T

Although they are finally happy with each...

Although they are finally happy with each other, Marissa and Ryan are forced to stay apart by their parents, Julie and Sandy. Dean Hess (recurring guest star ERIC MABIUS) pressures Seth and Summer into showing Harbor school spirit, which leads them to devise a covert plan to bring Marissa and Ryan together. When the scheme works, Marissa and Ryan have a night to remember, and Seth and Summer get caught by Taylor (recurring guest star AUTUMN REESER). Meanwhile, Caleb's will is read, leaving Ju

Marissa adjusts to life in her new surroundings...

Marissa adjusts to life in her new surroundings and makes some new friends at Newport Union, while Ryan wonders how their separation will affect their relationship. Seth's feud with Dean Hess (recurring guest star ERIC MABIUS) lands Summer in trouble, but some startling new information about Taylor (recurring guest star AUTUMN REESER) may turn the tables once more. Kirsten's friend Charlotte (recurring guest star JERI RYAN) lands in Newport with some big ideas, while Sandy mulls over the futur

Ryan makes a life-changing decision that...

Ryan makes a life-changing decision that Sandy surprisingly supports, and Marissa turns to her new public school friends for help with Ryan. The Harbor School's Dean of Discipline, Dean Hess (recurring guest star ERIC MABIUS), continues his crusade to ruin Ryan's future, and Summer and Seth go on their own crusade to reveal Dean Hess's secret. Meanwhile, Charlotte (recurring guest star JERI RYAN) makes Julie an offer she cannot refuse.

Taylor (recurring guest star AUTUMN REESER)...

Taylor (recurring guest star AUTUMN REESER) ruins Seth's night when she throws a Harbor School event that keeps Summer at a distance. Marissa's new friendships at public school worry Summer, and she enlists Ryan's help. Meanwhile, Sandy works on a plan for the Newport Group and forms a new partnership. And Charlotte (recurring guest star JERI RYAN) convinces Julie and Kirsten to edge back into Newport society.

When the gang heads to The Bait Shop to see...

When the gang heads to The Bait Shop to see the British rock band THE SUBWAYS (themselves), Taylor's behavior causes a major rift between Seth and Summer. Determined to end the potentially explosive conflict between Ryan and Kevin Volchok (recurring guest star CAM GIGANDET), Marissa watches out for Ryan. Meanwhile, Matt (recurring guest star JEFF HEPHNER), Sandy's Newport Group partner, goes above and beyond the call of duty. Julie reigns supreme as the only bitch in Orange County, and for on

As seniors at Harbor School and Newport Union...

As seniors at Harbor School and Newport Union prepare their college applications, Ryan, Seth, Summer and Marissa decide what to do about their futures. Will they go to college? Unable to make a decision, Marissa attends Johnny's (recurring guest star RYAN DONOWHO) surf competition instead of completing her college application. Meanwhile, Julie is forced to return to her roots, and Kirsten, eager to get back to work, asks a friend for help. Sandy invites an old friend from UC Berkeley to dinn

Ryan takes an internship working for Sandy...

Ryan takes an internship working for Sandy and Matt (recurring guest star JEFF HEPHNER) at the Newport Group, but he ends up working harder to save Matt's reputation. Determined to get accepted to Brown University, Summer and Seth do whatever it takes to stand out at Harbor School. Johnny (recurring guest star RYAN DONOWHO) finally tells Marissa how he really feels about her. After a stressful weekend, Ryan and Marissa cross paths and end up telling each other the truth about their time apart

After the teens spend hours picking out the...

After the teens spend hours picking out the perfect Christmas trees, they devise a special plan to help a friend in need. Meanwhile, missing her mom, Summer feels even more somber during this holiday, and Johnny's (recurring guest star RYAN DONOWHO) sudden misfortune forces him to take matters into his own hands. Kirsten tries to put the past behind her and make amends with Julie. Reminiscing Seth vows to put a little "mukkah" into Ryan's "chris," and Ryan gets "Bar Mitz-vahkkahed" on the thi

Summer, Seth and Ryan launch a campaign to...

Summer, Seth and Ryan launch a campaign to get Marissa back into The Harbor School, and Johnny (recurring guest star RYAN DONOWHO) struggles between a friend's happiness and his own feelings. Meanwhile, Sandy must make an ethical decision that could change Marissa's fate, and Summer's father, Dr. Neil Roberts (recurring guest star MICHAEL NOURI), and Julie are apprehensive about admitting to the lies they have told their daughters.

Fourteen-year-old Kaitlin Cooper (recurring...

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.Outstanding Episode

While Marissa does all she can to get to...

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.

Summer discovers the truth about Seth. Sandy...

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.

Tragic news forces the friends to sort out...

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

Sadie (recurring guest star NIKKI REED) and...

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.

Ryan struggles with the decision of whether...

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.

When an old nemesis returns to Newport, Ryan...

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.

Julie and Dr. Roberts (recurring guest star...

Julie and Dr. Roberts (recurring guest star MICHAEL NOURI) announce their engagement, and the Cooper ladies move in with Summer and her dad. Meanwhile, Marissa drifts away from Summer and the group when she seeks solace in the company of bad boy Volchok (recurring guest star CAM GIGANDET) and his crew. Ryan tries to move on with Sadie (recurring guest star NIKKI REED), but Seth's concern for Marissa gets in the way. At the Newport Group, Sandy's woes with Matt (recurring guest star JEFF HEPHN

The kids receive their college acceptance...

The kids receive their college acceptance and rejection letters, forcing them to make some life-altering decisions. Ryan and Sadie (recurring guest star NIKKI REED) try to decide what do after high school, and their decision concerns Sandy and Kirsten. Taylor (recurring guest star AUTUMN REESER) throws a college sweatshirt party at Harbor High School, and Marissa and Summer patch up their friendship. Meanwhile, the drama surrounding Sandy's job intensifies and starts to affect the Cohen house

Ryan leaves Newport to visit his mom, but...

Ryan leaves Newport to visit his mom, but before they meet, he has a steamy encounter with her co-worker. Meanwhile, Seth is keeping secrets, and Taylor (recurring guest star AUTUMN REESER) and Summer devise a foolproof plan to figure out what's going on with him. When their plan backfires, Summer is devastated. Julie Cooper visits a surprised Volchok (recurring guest star CAM GIGANDET) and gives him some stern advice. Later, Marissa confronts Volchok's friends and saves a girl from an inten

With graduation just weeks away, Ryan, Seth,...

With graduation just weeks away, Ryan, Seth, Summer and Marissa leave Newport to attend their respective pre-freshman orientations at Berkeley and Brown. While dropping the boys off at the airport, Kirsten is surprised to see Theresa (recurring guest star NAVI RAWAT) and her familiar-looking baby boy. At Brown, Seth runs into Anna (recurring guest star SAMAIRE ARMSTRONG), and they instantly connect. Meanwhile, Kirsten and Sandy attend a hospital benefit where Kirsten vents her frustration and

Harbor School's senior prom brings out the...

Harbor School's senior prom brings out the best and the worst in everyone. Taylor (recurring guest star AUTUMN REESER) has a great time, while Summer doesn't enjoy herself with her surprising prom date. Seth and Anna (recurring guest star SAMAIRE ARMSTRONG) come up with a plan to win Summer back for Seth. Meanwhile, Marissa convinces Volchok (recurring guest star CAM GIGANDET) to go to the prom with her, and Ryan brings an unexpected old flame. When one of the girls is elected prom queen, it

Dealing with the repercussions from prom...

Dealing with the repercussions from prom night, Ryan must make a deal with Volchok (recurring guest star CAM GIGANDET). Meanwhile, although Sandy is named Man of the Year by a magazine, the district attorney continues to investigate his unique involvement with the new hospital. After she receives a call for help from Kaitlin (recurring guest star WILLA HOLLAND), Marissa visits her little sister at boarding school. Ryan's bloodied hands force Theresa (recurring guest star NAVI RAWAT) to make a

The end of senior year is finally here, bringing...

The end of senior year is finally here, bringing the excitement of graduation and the anticipation of new lives in college and beyond. But for Seth, Ryan, Marissa and Summer, it's also a time to look back on the amazing journey that has brought the four of them this far. Seth must confront his recent misdeeds or deal with the wrath of Sandy--and the police. Ryan's proud mom arrives with a surprise for him. Marissa receives an astounding proposal that may radically change her plans. And Summ

The gala at the Newport Country Club is under...

The gala at the Newport Country Club is under attack from a demonic water polo player and the Atomic kids are called in to defeat him.

While patrolling downtown Newport on her...

While patrolling downtown Newport on her invisible Vespa, Lil' Miss Vixen learns of a shoe sale a few blocks away. But before she can buy anything, Vixen needs to catch the mugger who attacked a customer outside the store.

Cosmo Lass has to drink from her magic flask...

Cosmo Lass has to drink from her magic flask to use her powers. And on this particular evening there is much evil afoot. With each successive new villain she encounters, Cosmo Lass needs another drink. This makes her progressively more drunk and less effective as a crimefighter.

Punky Spitfire is a new superhero looking...

Punky Spitfire is a new superhero looking to join the Atomic kids. The Ironist welcomes Punky to their headquarters, but a catfight breaks out when Lil' Miss Vixen sees the Ironist being chummy with Punky.

Kid Chino is constantly pestered by The Ironist...

Kid Chino is constantly pestered by The Ironist as he tries to cope with a number of urgent calamities. Every possible means of communication is utilized to interrupt Chino while he's busy trying to save the world.

The Atomic kids are fighting a losing battle...

The Atomic kids are fighting a losing battle with a giant robot when a hero called the Mentalist arrives on the scene and uses his mental powers to blast the menacing machine. Invited to the Mentalist's swanky penthouse headquarters, the gang learns that this hero has ulterior motives for saving them.

The Atomic kids need to save their comrade...

The Atomic kids need to save their comrade All-American Boy, who has been captured by the villainess Mistress Widow. While the gang scuffles with the Arachnids (Mistress Widow's beefcake henchmen), Mistress Widow escapes with Cosmo Lass's magic flask. But for what purpose?

The Ironist and Kid Chino (joined by Sandy,...

The Ironist and Kid Chino (joined by Sandy, aka the Litigator) arrive at the shore for some much-needed rest and relaxation. But when they arrive, they find that the beach has been closed by the newly back-from-the-dead Caleb Nichols (aka The Industrialist). And the fate of the beach hinges on a surfing competition.

When an alluring bartender named Alex invites...

When an alluring bartender named Alex invites the Ironist back to her motel room, she transforms into the villainess Battle Axe. Can the rest of the team find them in time to save the Ironist from certain doom?

Kid Chino is being framed for crimes against...

Kid Chino is being framed for crimes against the elderly that were really committed by his evil brother, Trey. Chino and the Ironist must disguise themselves as old ladies to try to catch Trey in the act.

A jilted Johnny Harper (aka Johnny Tears)...

A jilted Johnny Harper (aka Johnny Tears) is on a hysterical rampage, his sulfuric acid tears leaving a wake of destruction behind him, because Cosmo Lass won't go out with him. It's up to the Atomic kids to stop him.

Villain Blinding Abs possesses the ability...

Villain Blinding Abs possesses the ability to mesmerize all women. Can Kid Chino and the Ironist defeat Cosmo Lass and Lil' Miss Vixen in order to bring him to justice?

Taylor (aka Type A) offers her skills as...

Taylor (aka Type A) offers her skills as PR manager to the team. But soon after Taylor takes the job, her micromanagement begins to drive the team members crazy. They decide to fire her ... if they could only figure out a way to do it.

The Industrialist has assembled Newports...

The Industrialist has assembled Newports greatest villains in an attempt to defeat the Atomic kids once and for all, setting up an epic battle between all of our heroes and villains.

Marissa meets Ryan for the first time, sparks...

Marissa meets Ryan for the first time, sparks immediately fly.

Seth puts his foot in his mouth while he...

Seth puts his foot in his mouth while he and Ryan bond playing video games.

After Seth embarrasses him at a party, Ryan...

After Seth embarrasses him at a party, Ryan saves Seth from getting beat up.

Ryan has a run-in with Marissa's boyfriend...

Ryan has a run-in with Marissa's boyfriend when he shows up to a cotillion with her.

Seth and Summer's argument leads to the gang...

Seth and Summer's argument leads to the gang running off the road and staying in a grungy motel til the car is fixed.

Ryan rescues Marissa who runs off into a...

Ryan rescues Marissa who runs off into a strange town after learning the truth about her boyfriend.

Marissa and Ryan get stuck on top of a ferris...

Marissa and Ryan get stuck on top of a ferris wheel which leads them to their first real kiss.

Rooney performs on The O.C.

Rooney performs on The O.C.

Oliver confesses his intentions with Marissa...

Oliver confesses his intentions with Marissa to Ryan which leads them to a fist fight that Marissa walks in on.

Seth makes a fool of himself to prove his...

Seth makes a fool of himself to prove his affections for Summer on Valentine's Day.

Luke breaks up with Julie; and when he talks...

Luke breaks up with Julie; and when he talks to Ryan about it, Marissa overhears.

Jem performs on The O.C.

Jem performs on The O.C.

Summer and Marissa bond by the pool while...

Summer and Marissa bond by the pool while enjoying ice cold cocktails

Marissa finally lets her mother know what...

Marissa finally lets her mother know what is on her mind after a summer of giving her the silent treatment.

Ryan makes a date with Marissa to catch up...

Ryan makes a date with Marissa to catch up after school; Summer gives Seth the brush off.

After finding out about Marissa's affair,...

After finding out about Marissa's affair, Ryan tells her he would rather be friends.

Seth makes a fool of himself and puts himself...

Seth makes a fool of himself and puts himself in danger to prove his love for Summer at the carnival.

The Walkmen perform on The O.C.

The Walkmen perform on The O.C.

The Killers perform on The O.C.

The Killers perform on The O.C.

Modest Mouse performs on The O.C.

Modest Mouse performs on The O.C.

The Thrills perform on The O.C.

The Thrills perform on The O.C.

Rachael Yamagata performs on The O.C.

Rachael Yamagata performs on The O.C.

In the midst of a storm, Marissa tells Alex...

In the midst of a storm, Marissa tells Alex that she is serious about her, and Summer rushes to find Seth.

Death Cab for Cutie performs on The O.C.

Death Cab for Cutie performs on The O.C.

When Seth ends up on a Spring Break TV show,...

When Seth ends up on a Spring Break TV show, his health, and his relationship with summer, are put in danger.

Things turn ugly when Trey misinterprets...

Things turn ugly when Trey misinterprets Marissa's kindness.

T.I. performs on The O.C.

T.I. performs on The O.C.

Caleb has a heart attack, while across town,...

Caleb has a heart attack, while across town, Sandy confronts Kristen about her drinking problem.

Ryan confronts his brother when he about...

Ryan confronts his brother when he about Trey's attempted assult on Marissa

Marissa and Summer face off against Taylor...

Marissa and Summer face off against Taylor Townsend when she tries to take over the spring carnival.

When a friend at her new school tries to...

When a friend at her new school tries to comfort Marissa, Ryan overreacts.

The Subways perform on The O.C.

The Subways perform on The O.C.

Just as Seth realizes that things are going...

Just as Seth realizes that things are going to well, Marissa's little sister shows up at the door.

Kaitlin gets ready for her party, and Seth...

Kaitlin gets ready for her party, and Seth tries to hide his pot use from Ryan.

When Johnny gets drunk and climbs up a cliff,...

When Johnny gets drunk and climbs up a cliff, Ryan tries to talk him down.

Tom Vek performs on The O.C.

Tom Vek performs on The O.C.

Sadie gives Ryan a birthday gift, and something...

Sadie gives Ryan a birthday gift, and something to think about.

Marissa wakes up after a night with Vochek,...

Marissa wakes up after a night with Vochek, and a stoned Seth forgets to invite Summer to dinner.

After Seth doesn't get into Brown, Seth tries...

After Seth doesn't get into Brown, Seth tries to break if off with Summer rather than have her jeopardize her future for him.

When Ryan shows up at Volchok's looking for...

When Ryan shows up at Volchok's looking for the stolen money, Volchok tries to provoke a fight.

Volchock tries to force Ryan and Marissa's...

Volchock tries to force Ryan and Marissa's car off the road.

Taylor tries to explain to Summer why she...

Taylor tries to explain to Summer why she is sleeping in Summer's bed.

Taylor is going home, but before she leaves...

Taylor is going home, but before she leaves she has some advice for Summer about Seth.

After hunting him for months, Ryan gets a...

After hunting him for months, Ryan gets a chance to finally confront Volchok.

Che and Summer attempt to free a group of...

Che and Summer attempt to free a group of the school's lab bunnies.

Ryan's fantasy about Taylor might just ruin...

Ryan's fantasy about Taylor might just ruin breakfast.

Seth tries to track down Che for a little...

Seth tries to track down Che for a little revenge, while Kaitlin gets revenge of her own by throwing a party.

At the kegger, Ryan tries to find Taylor,...

At the kegger, Ryan tries to find Taylor, Seth finally finds Che, and Kaitlin's rival admits her defeat.

Seth proposes to Summer... before they find...

Seth proposes to Summer... before they find out the results of the pregnancy test.

Taylor tells Summer that she's lost her way...

Taylor tells Summer that she's lost her way , and they discover that Panakes has given birth to bunnies.

Seth, Summer, Ryan, andTaylor all say goodbye...

Seth, Summer, Ryan, andTaylor all say goodbye to each other.