Don has an encounter with someone from the past. Meanwhile, Roger increases Peggy's workload, and Joan comes to a momentous decision.

Peggy's family hosts a lunch for their church's new priest; Don and Betty enjoy a weekend together; Pete and Ken take a client out to lunch; the staff works to prepare for a last minute pitch meeting.

Don decides to include Betty on a company business trip. Pete lends a hand to a neighbor in his apartment building.

There is trouble for Don and Sal in giving their clients what they ask for. Meanwhile, Betty hosts a fundraiser.

Don continues to conceal his increasingly complicated personal life, even in the face of Roger Sterling's invitation to open up. Meanwhile, Peggy pines for the absent Pete still on his honeymoon while fending off the advances of several of the men of Sterling Cooper.

It’s Valentine’s Day, and the Sterling Cooper advertising agency is hustling to stay on top of its game and buzzing over the newest office equipment. Don and Duck find themselves at odds over an account. Betty reconnects with an old friend and once again finds herself struggling with car trouble.

Paul hosts a party at his apartment and introduces someone special to his Sterling Cooper colleagues. Peggy visits her family for dinner. Despite a conflict of interest, the Sterling Cooper agency aggressively pursues an airline account and Duck attempts to appeal to the client using an unorthodox approach.

Don's father-in-law pays a visit to his daughter's family. Peggy works hard on a campaign while the firm tries to decide if they will accommodate an unusual request from a client. Elsewhere, Roger plans a wedding.

Don and Megan take a trip to Hawaii for the holidays, Sally's friend visits the Francis family, a comedian torpedoes Peggy's Super Bowl ad campaign, and Roger gets some bad news about his mother.

Pete returns from his honeymoon, excited about his new marriage, but conflicted about his past encounter with Peggy. After his business relationship with Rachel takes an unforeseen turn, Don attends a party which further illuminates his increasing dissatisfaction with his present life.

Don and Duck try to make peace; Peggy tries to get into the executive's after-hours meetings; Duck deals with a family visit.

Don makes some new friends on his trip to Los Angeles; Peggy looks for romance; Duck ponders the future of Sterling Cooper.

Don and his father-in-law cross paths. Meanwhile, Peggy is in search of a new roommate; and a rich new client is excited to be doing business with the firm.

For the Draper family, life has changed. The children must adapt to a new home, a new brother, and a new stepmother. Don seems to have everything a man could want. However, Megan, still employed at the agency, has difficulty interpreting Don's expectations for a sex kitten at home and a prim and proper employee at the office.

Don strikes up a friendship with the surgeon in his building, Peggy tries to save her campaign, Roger makes a scene at his mother's funeral, and Betty goes to Manhattan to find Sally's friend.

A taboo office romance is revealed. At a brainstorming session, Peggy proves to be more than a secretary, opening up new opportunities for her at Sterling Cooper. Meanwhile, Rachel faces her conflicted feelings for Don after he seeks out her advice on a new campaign.

The writers make an attempt to stave off late-night boredom during a mandatory overtime session. Roger throws a party as Joan and Greg host their own party. Sally has a run-in with Grandpa.

Sally's behavior causes concern for Don and Betty. Betty has an eye-opening dream that has a strange effect on her. Pete tries to work a new business angle in his dealings.

Megan has second thoughts about her future at Sterling, Cooper, Draper, Pryce. Peggy lashes out when she's inadvertently put in the uncomfortable position of having to lie. Pete's effort to protect an acquaintance doesn't turn out quite like he expected.

While Don continues his affair with Sylvia, Pete's latest infidelity threatens his marriage. Meanwhile, Peggy's icy relationship with her new staff continues, but she also gets an unlikely tip on a potential new client.

Don makes a new friend. Joan meets a client for drinks. Peggy hears impressive new work. Roger has a puzzling phone call.

Pete's professional and personal lives become more complicated as he struggles to assert power in both. While facing pressure from his wife regarding a new apartment, he further alienates Don and endangers his own position at Sterling Cooper.

Trouble arises on the set of a commercial; Harry tries to gather support for a controversial sponsorship; Betty and Don try to appease a client with a friendly dinner.

In the third-season opener, Salvatore and Don take a business trip out of town. Pete Campbell and Ken Cosgrove worry about the changes at Sterling-Cooper and how the changes will impact them.

Lane attempts to land an account with Jaguar Cars, leading to a altercation with Pete. Pete and Trudy host a dinner party in the suburbs.