Tensions run high at a boat party; Vicki fights to win the women back after a year of lies; Meghan starts in vitro fertilization with no help from husband Jimmy; new housewife Kelly Dodd's loud mouth gets her in big trouble.
Heather travels to Turks and Caicos to help Terry reconnect with their children; Tamra tries to save Ryan and Sarah's relationship; Kelly decides to befriend Vicki; Meghan invites the women over to her new house to demolish her kitchen.
Vicki and daughter Briana drive from Oklahoma to California; Meghan begins her in vitro fertilization shots without Jimmy; Kelly throws a beach party; Vicki and Tamra try to resolve their longstanding issues.
As Kelly's beach party moves indoors, Vickie and Shannon have a chilly face-off over their friendship; Meghan meets Jimmy's frozen sperm for the first time; Heather laments the impact of Terry's schedule on their family; Briana lands in the hospital.
Shannon throws a 1970s-themed party, during which she gets into an argument with Kelly; Terry schedules a work trip on Mother's Day; Meghan seeks support from her friends during her in vitro fertilization treatments; Tamra stirs the pot.
Following her party, Shannon pays a visit to Dr. Moon to remove toxins; Kelly tries to make amends by inviting Shannon to sit down and discuss the night of the party; Meghan travels to Washington, D.C., to speak on behalf of colorectal cancer.
Vicki revels in the return of her family to Orange County; Heather strives to find a work-life balance; Tamra plans a sushi party as a last hurrah for Meghan, but the party goes off rails after Kelly loses her cool and crosses a line.
After the sushi dinner, Heather and Tamra discuss Kelly's volatile behavior; Meghan takes the next step in her in vitro fertilization process; Shannon celebrates with her friends and family; Vickie and Kelly bond over being the odd women out.
While Shannon heads to Cabo, Tamra and Kelly join Vicki at the luxurious Merv Griffin estate in La Quinta, Calif.; Heather and Terry go out to dinner on date night; Tamra arranges a meeting between Kelly and Heather to work out their differences.
Tamra, Vicki, Heather, and Kelly take an unforgettable ride through the sand dunes at the motor-sports mecca of Glamis, Calif.; Tamra and Heather remain wary of Kelly's filthy mouth; Meghan receives the results of her pregnancy test.
The women recover from the accident in Glamis, Calif.; new alliances form in the wake of Meghan and Shannon's refusal to visit Vicki in the hospital; Tamra considers postponing her fitness competition.
Shannon panics over her upcoming move; the women help Shannon purge her closet; Vicki makes it clear she is ready to fill up her love tank; everyone gathers to watch the Beador girls perform; an uninvited guest makes a shocking allegation.
Michael and Kelly discuss their relationship since separating; Meghan goes to her first ultrasound appointment; Shannon packs up her house; Tamra treats Kelly, Vicki and Heather to a day of pampering at the spa; Kelly opens up about her marriage.
Meghan throws a party to celebrate the grand opening of her candle store; Vicki threatens to expose a secret about Shannon; Heather throws a fancy party to celebrate the release of her book; Meghan proposes a trip to Ireland to explore her heritage.
The women jet off to Ireland to explore Meghan's heritage; on a pub crawl, over-drinking leads to a sobering exchange of words between Tamra and Kelly; the women try to salvage their first day in Ireland by enjoying a traditional Irish Hooley Night.
After a bumpy start in Ireland, Meghan takes Kelly to nearby Greystones Village in an attempt to locate distant relatives, while Vicki, Tamra, Heather, and Shannon travel to a milk farm to get up close and personal with Ireland's finest cows.
The Ireland trip ends with a bus ride from hell; back in Orange County, the women try to make sense of their war on foreign soil; after months of diet and exercise, Tamra is ready to flaunt her body onstage at her long-awaited fitness competition.
The women gather at Shannon's new house for a carb-loaded affair to celebrate Tamra's victory at the fitness competition; Tamra, Heather and Shannon decide to confront Vicki about her vicious rumors.
The women come together to grill Vicki on her outsider status; Tamra discusses her award-winning derriere; Meghan opens up about her baby blues and her relationship with Jimmy; Kelly stands her ground as accusations start to fly; Andy Cohen hosts.
Kelly reveals shocking secrets about her past; Heather goes head-to-head with Kelly; Shannon talks about her rocky relationship with her mother-in-law; Vicki's daughter, Briana, dishes about her mother's relationship with the truth; Andy Cohen hosts.
The women recall their traumatic experience in Glamis; Meghan finds herself on the defensive over her lack of sympathy for Vicki; Shannon reaches her breaking point as the women revisit the ugly events that transpired in Ireland; Andy Cohen hosts.