After making an enemy in sorority president Holly, Naomi finds unusual allies who help her get revenge. Annie, short on money for sorority dues, must figure out a quick way to come up with the cash. Liam and Jane get closer, while Adrianna reveals a secret that causes Liam to look at her in a different light. Ivy becomes increasingly frustrated with her friends and lashes out at their lack of compassion, while Navid must deal with his uncle coming into town and trying to undermine Shirazi Studios.

In an effort to re-gain her status, Naomi rushes a popular sorority, where she, along with Annie go through sorority games. Annie finds out a shocking secret about new guy Jeremy that could affect her future. Liam decides to keep the bar he bought on a whim and has a surprise guest from Alaska come into town, while Dixon finds an unlikely roommate in country boy Austin, which could lead to trouble. The search for Navid's sister Leila forces Navid and Silver to enlist in Adrianna for help, much to the dismay of Silver.

Naomi immediately butts heads with the Blaze's new faculty advisor, Mr. Cannon, and is reprimanded in front of her peers. After failing to convince Navid to back her opinion, Naomi decides to tell a tiny lie that soon snowballs out of control. Adrianna is now the lead singer of the Glorious Steinems and confides in Silver and Naomi about her newfound feelings for Gia, and the two go out on their first official date. Teddy decides to test Silver by attempting to make her jealous. Dixon and his birthmother Dana continue to bond. Liam catches his stepfather with another woman and confronts him with his fist. Debbie and her instructor, Kai share tea and conversation after yoga, but Kai oversteps his boundaries.

Dixon struggles with temptation as he tries to make his way back into the music world, while Annie confronts Jeremy, who stands in the way of her inheritance. Naomi and Holly embarrass themselves in front of Janice Dickinson at a fashion show, while Navid reaches a breaking point with his uncle. Meanwhile, Teddy makes a big decision that upsets Silver.

Harry and Debbie plan a family bowling night, but find their plans interrupted by the unexpected arrival of Annie and Dixon's friends. Meanwhile, Annie finds herself torn between Ethan and Ty, Naomi experiences a difficult evening with her father, and Kelly and Silver learn that Jackie's drinking is beginning to spiral out of control.

Annie, Harry, and Debbie are surprised to find out that West Beverly's theater director can't direct the school musical anymore. Kelly persuades Brenda to take over as the play's director, but they end up arguing over Kelly's involvement with Ryan. Meanwhile, Dixon tries to get a part-time job at the Peach Pit and Naomi confronts her father's mistress.

Gia encourages Adrianna to audition for a new band and admits she has a crush on Adrianna. Dixon's birthmother, Dana drops by for a surprise visit and tries to develop a relationship with her son. Silver and Teddy go on their first official date but Silver finds it difficult to deal with Teddy's playboy past and enlists Naomi's help to track his whereabouts. Navid returns from his suspension to find that Naomi has started a gossip segment during Blaze News, which he adamantly opposes. Navid decides to get back into he dating scene by asking Lila out on a date, his first since breaking up with Adrianna. Annie realizes that Jasper has started following her around town. Debbie confides in Kai, her yoga instructor, about the arrival of Dixon's birthmother.

In the season four premiere, gang from Beverly Hills have graduated from high school. Naomi has spent the summer dealing with the shocking news of her pregnancy and quickly discovers she doesn’t have the status at college that she did in high school. Annie receives some unexpected news that keeps her in town, while Liam returns from his summer away ready to commit to Annie. Dixon finds himself without a roommate or a place to live, while an unexpected visitor tests Navid and Silver’s relationship after they move in together. Adrianna comes back to town looking for redemption, which she soon learns will be hard to earn back. Ivy and Raj struggle to deal with Raj’s health getting worse, while Teddy struggles with coming out to his family.

Liam gets offered a modeling job after an agent sees the commercial for his bar, while Annie finds herself starting to fall for an unlikely guy. During a charity talent show event to raise money for an experimental cancer treatment for Raj, Naomi is determined to win the contest in order to show up Austin's out-of-town visitor Sally. While working on his music, Dixon pushes his limits and starts spiraling out of control, which forces Adrianna to confront him.

Silver’s video of Teddy's Vegas wedding is leaked to the press, and has damaging effects on his uncle’s campaign. Liam’s modeling career is taken to the next level by Shelia and Annie is determined to help Dixon, even though the help he needs comes at a high price. Meanwhile, Ivy and Raj decide to plan for the future.

In an effort to put her inheritance to good use, Annie volunteers to organize a big charity fundraiser. When Naomi takes drastic measures to land her first event-planning client, her big plan back-fires. Meanwhile, Silver realizes she still has feelings for Navid, and Vanessa vows to make Liam a huge star after his agent drops him.

Naomi’s sister Jen arrives with her son for a surprise visit. Adrianna and Dixon land a meeting with a major movie producer to discuss music on his next film, but are sabotaged by Vanessa. Meanwhile, Silver gets accepted into New York University and Ivy attracts attention in the underground scene when she switches to a less conventional style of art..

In part one of the series premiere, Harrison Wilson accepts the job position as principal of West Beverly Hills High, forcing the Wilson family to relocate from Kansas to California and adjust to new life in the city - all while keeping a close watch on their troubled grandmother Tabitha.

In part two of the series premiere, Dixon must deal with jealous teammates on the lacrosse team and Annie is dumped by her boyfriend back home but soon meets a potential love interest.

Brenda receives life changing news. Meanwhile, Dixon grows closer to Christina, and an unexpected secret is destined to rock Adrianna's world.

Adrianna's new romance with pop star Javier continues to blossom, while Navid continues to work up enough courage to tell her how he feels. Jen has taken control of Naomi's finances and puts her on a tight budget, resulting in an instant meltdown by Naomi. Without her credit cards, Naomi is too distracted to realize Liam is in need of support to deal with the departure of his father, so he turns to Annie for comfort. Despite Spence's suggestion, Teddy refuses to end his relationship with Silver, and the two decide to spend the night together. Ivy invites Dixon to spend the summer in Australia with her and Laurel, but the idea doesn't go over well with his parents. Harry and Debbie's problems escalate when she finds out that Harry has been hiding Dixon's gambling issues from her. Meanwhile, Jasper returns to resolve things with Annie.

Silver is asked to make campaign videos for political candidate Marissa Harris-Young who is running against Teddy’s Uncle Charles for public office. Teddy runs into an old flame and Annie gets stuck with Leila during an important date. A surprise visitor threatens to tear Liam and Jane apart, while Naomi can't shake her growing feelings for Austin during a party to encourage students to vote.

Dixon tries to pursue a relationship with a resistant Adrianna, while Ivy and Raj’s arguing takes a toll on their relationship. Liam plans a holiday dinner for the gang, and an unexpected guest shows up. Meanwhile, Naomi goes to extremes to prove her love to Austin.

Navid and Gia launch an investigation into student drug use at West Beverly for Blaze News, which leads them to Annie's boyfriend, Jasper leaving Annie torn over who to believe. Fresh off his break-up with Adrianna, Navid receives dating advice from Samantha Ronson while out with Liam, Teddy and Ivy at the Edison. Worried that Adrianna will relapse, Naomi and Silver enlist Navid's assistance. Dixon reveals his situation with Sasha to Debbie and Harry, prompting Debbie to do some investigating. Jen and Ryan meet up with Pharrell to watch a performance of N.E.R.D.

Naomi returns from her vacation in St. Bart’s excited to spend time with Liam, which leads to the two getting up close and personal in his newly built boat. Adrianna and Gia bond during an AA meeting and establish a support system for each other which leads to the two sharing a kiss at the Beach Club. Navid and Dixon devise a plan to eliminate Jasper from Annie’s life, but never anticipate the outcome of a school drug search. Dixon attempts to rekindle his relationship with Silver, while Silver hides her true feelings for Teddy. Harry and Debbie run into Kelly while attending a school function and Debbie confronts Kelly about having a crush on Harry.

Annie deals with the outcome of Jasper’s decision to jump from the Hollywood sign and begins to find some peace with her situation. Silver and Teddy decide to double date with Liam and Naomi, which makes Dixon and Ivy feel left out, so the two decide to fake date. Adrianna and her band perform for the first time at the Beach Club and, with her newfound confidence, Adrianna decides to make her relationship with Gia official in a very public way. Liam encourages Naomi to come forward with her sexual harassment case, which causes her to continue her lie.

As a result of falsely accusing her faculty adviser of sexual harassment, Naomi is now required to complete community service and publicly apologizes to her peers for the trouble she has caused. The gang is preparing for the SAT’s when Silver disagrees with Teddy’s decision to skip college to focus on his tennis career and things grow even more tense when she meets his movie star father, Spence. Liam and his father, Finn, reconnect and attempt to rebuild their relationship. Navid and Dixon host an underground gambling party that results in Dixon owing Mark a lot of money. Debbie reveals to Harry that she kissed another man, which forces the two to finally discuss their recent problems. Annie overhears their parents conversation and turns to Liam for support. Just when Naomi thinks her life is back on track, her evil sister Jen returns to Beverly Hills.

Navid surprises Dixon with some studio time to apologize for messing things up with a music producer, where Dixon feels the pressure to create a hit song. Naomi plots revenge to take down rival Holly and her sorority during the Greek games, which requires Austin's help, much to Naomi's dismay. Silver directs a disastrous commercial for Liam's bar, while Ivy feels torn between her relationship and her friends.

Naomi has to work with her arch-nemesis Holly to throw a campus costume party, leading to unfortunate consequences. Navid's plan to bring down his Uncle Amal is threatened, while Silver discovers that political candidate Marissa Harris-Young is not who she seems. Meanwhile, Adrianna handcuffs herself to Dixon in an attempt to get him to stay sober and Annie must decide if she wants to give Patrick another chance.

Naomi is asked by her new party planner boss Rachel to oversee her arch-nemesis Holly’s birthday party, while Annie breaks into Jeremy’s apartment in a desperate attempt to get the proof she needs to keep her inheritance. Navid finds trouble after going with his Uncle Amal to make a deal with a potential buyer, and Liam discovers shocking news about Annie.