Top adman Don Draper works at one of New York's most prestigious ad agencies in the 1960s and '70s, but his personal life sometimes gets in the way of his performance at the office.
Pete is furious when Roger hijacks a meeting. Meanwhile, Joan's mother tries to dissuade her from going back to work and Megan plans a surprise 40th birthday party for Don.
Lane Pryce faces a dilemma when he makes a discovery in the back of a taxi, while an ill-advised remark leaves Harry Crane fearing for his future at the company.
Peggy is given the job of recruiting a new copywriter when Sterling Cooper Draper Pryce lands a potentially valuable client, while Don and Harry try to fulfil an unusual request.
Roger piles more work on an already put-upon Peggy, while Don is taken aback when he runs into a face from his past. Joan realises she must make a decision.
Lane Pryce develops an intriguing new friendship, while Pete tries to turn on the charm when he entertains guests.
A particularly difficult pitch tests Peggy's mettle - and leaves her questioning her abilities. Meanwhile, the company once again relies on Don to impress a potential client.
Don is honoured at a banquet, but finds his professional reputation has been damaged. Meanwhile, Megan comes up with a last-minute pitch to save the Heinz account.
Peggy is irritated when she is forced to keep a secret. Pete does a favour for a friend, while Don receives a piece of unexpected news.
Don's competitive streak re-emerges when he catches sight of Ginsberg's work. Meanwhile, Roger searches for new business and Betty struggles to control her weight
Harry Crane takes it upon himself to help a friend at Christmas time, while festive wishes look set to come true for some of his colleagues.
Don assembles an all-male team for the company's most important pitch to date - leaving Peggy feeling sidelined. A lucrative offer puts Joan in an awkward position.
Sally chooses not to join her family on a skiing trip and instead spends the weekend in Manhattan - where she is reunited with her childhood friend Glen Bishop.
Buoyed by the agency's recent successes, the partners consider expanding the office onto a second floor, though Don is preoccupied with a health issue.