Sterling Cooper is in play and the office scrambles without Don and Betty learns some disconcerting news.
An old friend and Don renew acquaintances; Pete's personal problems impact a major account; Joan introduces her fiancé around the office.
Don takes a business trip to Los Angeles, where he hooks up with some interesting new acquaintances; Peggy's in the mood for an office romance; Duck contemplates the future at Sterling Cooper.
Betty visits her ailing father; Paul's girlfriend, Sheila, advises him about his civic responsibilities; Pete's mother tries to put the kibosh on an important family move that he and Trudy are planning.
Freddy Rumsen strikes out during a pitch meeting with his team; ever-eager Pete seizes a chance to exploit an opportunity at the office; an old friend is the beneficiary of Don's loyalty; Sara Beth proves to be a welcome ally for Betty.
To win over an imported beer brand as a new client, Duck and Don try to appeal to a new market demographic. Harry's overwhelmed with his department's workload and finds assistance from an unlikely source. Father Gill convinces Peggy to become part of a pro-bono church project.
When Roger and Don hit the town together Roger's behavior puts a strain on their relationship.
Rumors spread in the office about a surprise romantic affair. Peggy's ideas get noticed during a pitch meeting and her future at the agency begins to look more promising. Don asks Rachel's advice about an ad campaign.
Don's past catches up to him when he wins an award and gets his picture on a prominent industry periodical. Ken makes his colleagues jealous when he gets a short story published in a national monthly magazine.
Don teaches Pete a lesson when he oversteps his authority in dealing with a valuable client. At home, Pete is pressured from his newlywed bride to buy their own apartment unit.
Upon returning from his honeymoon, Pete is troubled by what happened with Peggy at his bachelor party. Don's professional relationship with Rachel undergoes significant changes.
Betty consults with a specialist about her health issues; Don is pressured to help with Nixon's presidential campaign; Peggy fends off the coming advances of one of the copy writers.
On Valentine's Day, the staff of the Sterling Cooper Advertising Agency is hustling and checking out the newest office equipment. Don and Duck clash over an account, and Betty hears from an old friend.
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