Katie and Schwartz attempt to maintain a friendship in the wake of their recent divorce; James introduces his new girlfriend Ally to the rest of the group; tensions between Schwartz and Lala bubble over when one of them commits an act of betrayal.

Raquel cozies up to Peter in an attempt to get over James; Lala opens up about the origins of her last relationship; James throws Raquel under the bus to Lisa; Katie comes face to face with the bar that led to the demise of her marriage.

Lala drops a bombshell on Raquel that shakes the foundation of their newfound friendship; Sandoval takes some time away from the bar to play rock star with his cover band; Ariana and Katie take the next step in opening their sandwich shop.

James finds himself at the center of the rumor mill when he gets kicked out of a nightclub while fighting with Ally; Katie tries to keep her ex in line with another ultimatum; Tom and Tom host a friends-and-family event at Schwartz and Sandy's.

Katie plans a divorce party trip to Las Vegas and Lake Havasu but conveniently leaves Scheana off the guest list; Lala and Raquel find themselves flirting with the same guy; Ariana receives devastating news from home.

James starts to spiral when he feels that his friends are choosing Raquel over him; Lala breaks her yearslong dry spell when she hooks up with a new guy; Katie and Scheana clash over a hotel room snafu.

Lisa and Ariana plan a surprise bridal shower for Scheana; James makes it his mission to score Ally an invitation to the wedding; Raquel and Schwartz take their flirting to the next level; the group travels to Cancun to celebrate Brock and Scheana.

Katie and Schwartz celebrate a milestone in their breakup with an extravagant dinner that quickly goes south; Scheana erupts on Lala for skipping wedding events to avoid Raquel; James must atone for his behavior when his temper gets the best of him.

Scheana and Brock marry in a lavish ceremony in Cancun; James and Katie must sort through their feelings after their exes hook up with one another; Lisa attempts to solve the Toms' problems; Lala puts Raquel in her place.

Back in Los Angeles, Lala celebrated her birthday with an epic party; Raquel sets her sights on Oliver after being rejected by Schwartz; Tom and Ariana discuss their plans to make embryos together; Ally and James witness a suspicious interaction.

Sandoval opens up to Schwartz about his romantic problems with Ariana; Scheana blames Katie for spreading a sordid rumor about some of their friends; Ariana suffers another big loss; James plans an epic beach day that takes a turn for the worse.

Raquel's birthday dreams come true when she embarks on a glamping trip with some of her closest friends; Lala grows suspicious about Sandoval's interest in Raquel; James and Ally attempt to work out their issues following a disastrous beach day.

Ariana and Katie host a preview party for their sandwich shop; James takes an exciting step forward in his career; Tom and Ariana have a serious talk about the state of their relationship; Raquel confronts Katie for rage-texting Schwartz.

Cameras pick back up after Ariana discovers that her boyfriend of nine years is having an affair with one of her best friends; Schwartz panics when the scandal threatens to upend their business; Sandoval comes clean with another shocking secret.

Andy Cohen sits down for intimate one-on-one interviews with Ariana, Tom and Raquel to get to the bottom of the cheating scandal; James nearly comes to blows with Sandoval over the affair; Katie and Schwartz rehash the implosion of their divorce.

Lisa and the SUR staff open up about their issues with Stassi; Tom Sandoval and Ariana confront Kristen over Miami Girl; Tom Schwartz responds to Katie's marriage ultimatum; Stassi reveals the real reason she is no longer friends with Scheana.

Raquel faces her former friends; the group revisits the disastrous girls' trip to Las Vegas and Lake Havasu; they discuss Tom Schwartz's alleged role in covering up the affair; Andy questions Sandoval and Raquel about their relationship.

A deeper glimpse into the fallout of the group post-#Scandoval; never-before-seen moments from the summer shed a new light on glaring secrets that have since been revealed; Tom and Katie face the reality of their divorce while still living together.