Tomorrowland (Mad Men)

It is October 1965.^[1] Don Draper is apprehensive due to a morning business meeting and an upcoming trip to California with his children. Don and Pete Campbell meet with the American Cancer Society to discuss potential ideas for a campaign, which results in a potential meeting with Dow Chemical. Later, Roger Sterling, Don, and Pete try to convince Ken Cosgrove to invite his future father-in-law to a round of golf with Pete, but Ken declines, preferring to keep his personal life separate. Lane Pryce gives Joan Harris a promotion, but in name only due to the firm's precarious finances.

As Betty Francis prepares to move her family out of their home, Carla permits Glen Bishop to say goodbye to Sally. Betty, upon finding Glen in her house, fires Carla, then phones Don and informs him that she does not want her to accompany Don and the kids to California. Stuck, Don impulsively asks Megan to accompany them and take care of his children. Later, Henry is furious with Betty over the decision to fire Carla and her refusal to provide her a letter of recommendation.

In California, Don discovers that Megan is great with his kids. He takes the kids to visit Anna Draper's home, where Anna's niece, Stephanie (Caity Lotz), gives Don the engagement ring that Anna had received from the real Don Draper.

Peggy receives a visit from her friend at Life magazine, who in turn introduces Peggy to a model who had just been fired from a commercial assignment for Topaz Hosiery, who has fired their ad firm and scrapped all of their ideas. Peggy passes this information to Ken Cosgrove, who is able to secure a meeting during the holiday weekend. The executives are receptive to Peggy's ideas during the meeting and hire the firm, their first new account in months.

Megan returns from a night out with her college roommate, and she and Don spend the night together. During breakfast the next morning, Bobby and Sally spill Sally's milkshake all over the table. Expecting an angry reaction, Don and the children are surprised when Megan calmly cleans up the milkshake and defuses any lingering tension. Later, back at Don's apartment in New York, Don tells Megan that he's in love with her and proposes marriage, which she accepts.

At the SCDP offices later that day, Don tells the other partners and Joan about the engagement, receiving their congratulations after a moment of shock. Peggy and Ken, elated over landing the Topaz account, are caught off guard when they learn of Don's engagement. After stalling, Don finally calls Faye Miller to end their relationship and inform her of his sudden engagement. Later, Joan vents to her husband over the phone, and reveals to the audience that she did not get an abortion and is having a baby soon.

Don arrives at the Ossining house and is surprised to find Betty still there, having arranged to meet a real estate agent. Betty confides in Don that her new home isn't perfect; Don tells her that if it isn't perfect she can move again, then tells her that he is engaged. Betty, shocked but not surprised, congratulates him. When the doorbell rings, Don walks out to answer the door and Betty walks out in the opposite direction.

• The lullaby that Megan teaches Sally and Bobby is "Il était un petit navire".
• The show closes with the song "I Got You Babe" by Sonny and Cher.^[2]