Season 5 begins with Sonja hosting a party to introduce three new cast members—Aviva Drescher, Carole Radziwill and Heather Thomson. But the successful bash takes a dramatically downward turn when Ramona arrives and revelations come to light.

LuAnn and Ramona try to mend their relationship, but accusations and denials complicate matters. Meanwhile, gossip and chatter upset Ramona, and dramas swirl around Sonja at an awards event.

Carole throws a brunch in her hip neighborhood; Sonja sets out to launch a catering company; Heather invites some of the gang to tag along on her business trip to London.

Ramona plans a lunch gathering to discuss her issues. Sonja is invited, but she instead opts to have a secret meeting with LuAnn. Meanwhile, Sonja hosts a party, but cracks begins to show in her friendship with Ramona.

Plans for Heather's London trip spin into motion, but Aviva grows concerned that Ramona will be excluded. Ramona and Heather meet to table their differences, but things sour quickly—and Ramona leaves without a London invitation. Meanwhile, Sonja is enlisted to plan an anniversary party for Aviva.

Carole, Sonja, LuAnn and Heather bask in a trip to England. The ladies stay at a well-appointed penthouse and later have a slumber party, where they bond, play games—and dish on Ramona. In New York, Ramona and Aviva shop for shoes.

A London getaway winds down with a game of croquet and a battle royal heating up between Carole and LuAnn. Back in the Big Apple, Aviva throws her anniversary party, where she ends up taking a tumble down stairs in front of everyone.

Four of the ladies discuss a London trip and an anniversary party; Sonja works on her brand; LuAnn hosts a wine event, where Ramona's wine undergoes a blind taste test; Aviva plans a trip to Miami; and disturbing news about LuAnn comes to the fore.

The ladies have a dinner get-together in Miami with Sonja and her date—who happens to be Aviva's lusty father. Later, Aviva seeks advice on how to deal with Ramona, and Carole calls out LuAnn about a past misdeed.

Ramona invites all the ladies—except for Heather—to a dinner, but the heat is on when LuAnn slights Carole. Elsewhere, LuAnn throws a holiday party, where a boozy Sonja squares off against LuAnn and the ladies get up on stage to sing.

Carole throws a holiday bash, and Aviva's libidinous father is among the partygoers. Elsewhere, Sonja arrives at her photo shoot an hour late, irking Heather; Carole completes her book and invites the ladies on an island getaway to celebrate.

Aviva throws a charity event to benefit children in need of prosthetics—but tensions rise when both Ramona and Sonja are no-shows. Elsewhere, Aviva's fear of flying could keep her from attending Carole's trip to St. Barts.

The ladies land in St. Barts—sans Aviva, whose phobias keep her home. The wives delight in their high-level villa and take in a night that features tequila shots, a pirate-theme performance and flirtations with their sightly liaison.

An island getaway continues with a party at the ladies' villa, but only two guests make appearances. Later, the wives take in a yachting adventure; and Aviva heads to St. Barts despite her fear of flying.

The ladies' vacation continues, yet Ramona frets that it's turning into a couple's retreat. On the final night, Sonja and Ramona spark tension when they duck out on the wives' original plans to see a concert.

The wives return from their vacation, but fallout from the trip creates dramas. Elsewhere, a surprise awaits Carole when she crosses paths with a former suitor.

Aviva's father returns and visits a health-food store with his daughter; Sonja negotiates a settlement with her former husband; and Heather preps for her fashion show and has a surprise request for Aviva.

Social events spin out of control in the Season 5 finale. Here, Ramona is seemingly at the center of showdowns, including Heather's fund-raiser (Ramona vs. Sonja) and Carole's book party (Ramona vs. Heather, plus Ramona vs. Aviva).

Part 1 of 2. Andy Cohen hosts a reunion edition featuring the Big Apple ladies.

Conclusion. Andy Cohen hosts a reunion featuring the regrouped New York ladies. Topics include Season 5's confrontations.

Previously unseen footage from "The Real Housewives of New York City" includes the ladies' business ventures, vacation dramas, snippets of the wives speaking in "baby talk," and the discovery of a prosthetic leg.