Lisa Vanderpump introduces the group to her friend Dorit, whose permanent houseguest is Boy George. Erika celebrates her 45th birthday in style with a 1970s-inspired Studio 54 party and receives more than one birthday surprise. Lisa Rinna and Eileen awkwardly come face to face with Lisa Vanderpump for the first time in months.

Erika auditions dancers for her new music video “Xxpensive.” Dorit's extravagant birthday party provides a few surprises, both planned and unplanned. At the party, Lisa Vanderpump shows Lisa Rinna and Eileen exactly where they stand.

Kyle and Lisa Rinna cross paths in New York City while traveling with their daughters. Back in Beverly Hills, Lisa Vanderpump surprises Ken with a $25,000 watch on his birthday, and Eileen continues to struggle with the loss of her mother. Later, over drinks with the group, Erika's short dress leads to quick peeks and judgments passed.

Dorit questions whether Erika’s wardrobe malfunction was intentional, while Lisa Rinna dominates the fashion world with a 24-hour garment selling marathon. Erika explores a future in acting with Eileen. And when Dorit employs a risky maneuver to confront Erika, the ladies worry they won’t be able to escape a challenge they’ve taken on together.

Lisa Vanderpump and Kyle talk female rejuvenation with a plastic surgeon, while Lisa Rinna and Erika meet Eden, daughter of hairstyling icon Vidal Sassoon. Dorit hosts a dinner party where she and her husband PK question Lisa Rinna and Eileen’s grieving decisions. When confronted, Dorit remembers nothing, leading to flared tensions at a luncheon at Camille Grammer's new Malibu house.

Despite having disastrous parties in the past, Kyle cautiously hosts a game night for all the women, which leads to compromising positions and plenty of laughs. Lisa Rinna and Kim reunite and their feud is reignited, while Dorit and Eileen exchange angry words.

After her explosive encounter with Kim at Kyle’s game night, Lisa Rinna vents to Eden. Erika records the music video for her new song before jetting off to Mykonos, Greece, with Kyle. Lisa Vanderpump’s son Max begins a quest to find his biological parents, while Dorit tries to find common ground with Lisa Rinna and Eileen.

Lisa Rinna reveals the recipe for her favorite smoothie while Eden is suspicious about Kim Richards’ sobriety. Erika Jayne performs in Greece for her biggest crowd ever and Dorit shocks the ladies by having Boy George perform at her husband’s birthday party.

Eileen is thrilled when Erika nails her reading at The Young and the Restless. Lisa Rinna throws a barbecue, but Harry ends up doing most of the work. Kyle hopes Lisa Vanderpump will show up at her Great Gatsby party, but it's Eden who causes a scene there when she voices her true feelings about Kim.

As the women pack for their trip to Mexico, Eden stops by Lisa Vanderpump's house to tell her what Lisa Rinna said about Kim's sobriety. With Lisa Rinna in NYC to see her model daughter walk at Fashion Week, the ladies in Mexico discuss her shocking comments.

Tensions run high at Mauricio’s party in Mexico, as Kyle demands to know exactly what Lisa Rinna said about her sister Kim. Eden seeks her mother’s advice regarding Kyle and Kim. Erika advises Rinna to come clean with Kyle, but Rinna maintains she’s done nothing wrong. The Mexico trip wraps up with a wild boat ride and a dance to remember.

After a tear-filled Mexico trip, Lisa Rinna confronts Eden over the “near death” accusations. Lisa Vanderpump buys her son Max a condo, and the scripted show inspired by Kyle's childhood becomes even more of a reality. Lisa Rinna is honored with an award from her favorite charity, but Dorit has increasing suspicions about what she sees as erratic behavior from Rinna.

Kyle hosts a party at her store where Lisa Vanderpump's invitations to Hong Kong get out of hand. The ladies gather at Villa Rosa for lunch, where Dorit tries to chip away Erika's icy personality. After lunch, Erika flies back home to Georgia to see her mother and reconnect with her roots.

The women head to Hong Kong, where Lisa Vanderpump's effort to stop animal cruelty continues. Meanwhile, Erika confides in Kyle about visiting her mother in Georgia, and past conflicts explode aboard a historic junk boat, pitting Dorit against Lisa Rinna against Erika.

Tensions between Dorit and Erika continue to rock the boat in Hong Kong. Lisa Rinna and Eileen pick a side while Lisa Vanderpump and Kyle watch in shock. Will visiting the second largest Buddha in the world cure the madness or just serve as an intermission? That question is answered at an even more shocking dinner.

Still in Hong Kong, Lisa Rinna defends her scandalous accusations about Dorit. The ladies’ hearts are warmed when they visit the SPCA to see the dogs that Lisa Vanderpump has helped rescue. Later, back in Beverly Hills, Erika shoots her scenes for The Young & the Restless before everybody heads to Villa Rosa for a spectacular Diamonds and Rosé party.

Lisa Rinna and Erika's unresolved issues with Dorit come to a head at Lisa Vanderpump's Diamonds and Rosé party, which is filled with fabulous food, glittering ponies and lots of tension. When Dorit’s efforts to defend herself fall on deaf ears, her husband PK joins the fray. Eden shocks the women by unleashing an epic tirade on Lisa Rinna.

The climactic reunion begins with Erika addressing the claims that she has an icy demeanor, while new housewife Dorit defends her parenting skills. Meanwhile, wounds have not fully healed between Lisa Vanderpump, Lisa Rinna and Eileen; and tensions escalate when Dorit’s divisive husband PK joins the ladies on the couch.

Drama continues to run high as Erika, Eileen and Lisa Rinna stand their ground against PK’s attempts to explain himself. The women share insights into their various careers and laugh at the over-the-top ways they greet each other. However, things take a turn when Eden and Kim Richards join the ladies. Simmering issues quickly come to a head and it all becomes too unbearable for one of the ladies.

As the reunion comes to a close, all the harsh feelings force the women to evaluate the bonds they have forged over the years. Lisa Vanderpump gets surprisingly emotional when discussing her son and her crusade to save dogs. Lisa Rinna and Kim Richards attempt to see eye-to-eye, while Kyle decides to dive into the fray.