Episode 1: Public Relations
Original Air Date — 25 July 2010
Don’s reluctance to talk about himself jettisons a prestigious trade-paper interview that the company was hoping would be a boon to business. Meanwhile, the “wholesome” manufacturer of two-piece swimsuits wants to hire the firm but doesn’t want a sexy ad campaign; Pete and Peggy stage a stunt in an effort to secure more money from a meat-company client; and Roger plays Cupid for Don.

Episode 2: Christmas Comes But Once a Year
Original Air Date — 01 August 2010
The agency’s Christmas party is nearly spoiled by the late arrival of a surprise and not-so-welcome visitor; Sally reconnects with Glen Bishop, while Freddy Rumsen resurfaces at the new agency; Don makes a mistake with his secretary.

Episode 3: The Good News
Original Air Date — 08 August 2010
Lane and Joan get into a disagreement at the agency and a mix-up with flowers has a hand in Lane’s wife staying in London indefinitely. Don leaves for Acapulco with a stopover in Los Angeles. While in LA, Don visits Anna Draper. Once back in New York, Don and Lane get to know each other better on New Year’s Eve.

Episode 4: The Rejected
Original Air Date — 15 August 2010
Pete must break bad news to his father-in-law but receives wonderful news about him and Trudy. Don gets into a confrontation with Allison after a focus group. Peggy meets an eccentric girl named Joyce in the building.

Episode 5: The Chrysanthemum and the Sword
Original Air Date — 22 August 2010
Don and Pete try to land a new client but Roger’s attitude about the potential client may ruin their chances of showing up their competition. Also, Sally acts out and Betty wonders if therapy is the solution.

Episode 6: Waldorf Stories
Original Air Date — 29 August 2010
Don has a wild lost weekend after winning a CLIO award, while Peggy is forced to work all weekend in a hotel room with an “uninspired” co-worker. Meanwhile, Peter is livid after he learns that the other partners hired Ken Cosgrove.

Episode 7: The Suitcase
Original Air Date — 05 September 2010
Don deliberately delays returning an important call from California, because he knows it’s bad news about Anna. Instead, he keeps himself occupied by forcing Peggy to miss her birthday dinner to pull an all-nighter with him for a client.

Episode 8: The Summerman
Original Air Date — 12 September 2010
While Don’s thoughts turn inward while he deals with Anna’s death, Peggy is placed in a difficult situation when an obnoxious new hire in the creative department is disrespectful to Joan.

Episode 9: The Beautiful Girls
Original Air Date — 19 September 2010
Sally makes an unwelcome surprise visit to the office to see Don, Peggy tries to stop an acquaintance from publishing an article that could get her in hot water, and Roger Sterling tries to reconnect with Joan.

Episode 10: Hands and Knees
Original Air Date — 26 September 2010
Don becomes frightened that his lie will be exposed when government agents question Betty about him, Lane has shocking news for his father when he comes to bring him home, and Joan is forced to have an abortion.

Episode 11: Chinese Wall
Original Air Date — 03 October 2010
An all-hands meeting is called for the employees of Sterling Cooper Draper Pryce, and the gossip starts to fly.

Episode 12: Blowing Smoke
Original Air Date — 10 October 2010
While trying to navigate a crisis, Don encounters an old friend.

Episode 13: Tomorrowland
Original Air Date — 17 October 2010
In the Season 4 finale, a surprising opportunity rears its head for both Don and Peggy, leaving them with life-altering decisions to make.