Megan throws Don a surprise birthday party, the war between Pete Campbell and Roger Sterling intensifies, and new mother Joan begins to wonder if she still has a job when she's ready to come back.
Lane finds a wallet in a cab and decides how to handle it. The fallout from the party leaves Don and Megan upset. Joan has a hard time dealing with her mother.
As Sterling Cooper Draper Pryce tries to build upon its current business, Peggy is given new responsibility. Don and Harry indulge a client.
Don runs into someone from his past. Joan makes a decision, and Roger gives Peggy extra work.
The episode occurs roughly two weeks after the previous one--around the time of Charles Whitman's shooting rampage at the University of Texas Austin. Pete and Trudy host a dinner party in the suburbs, attended by Don, Megan, Ken, and his wife. Pete also attends driver's education classes where he views the film, Signal 30, and flirts with a young woman. Lane attempts to land an account with Jaguar Cars, leading to a physical altercation with Pete.moreless
Peggy deals with relationship trouble and a pitch for Heinz beans. Don and Megan visit potential hotel chain client Howard Johnson's upstate. Jane convinces Roger to experiment with LSD.
Don, Roger and Pete attempt to bring in new business. Sally comes to the aid of a relative.
Peggy becomes angry when she is forced to keep a secret she doesn't want to keep; Pete sticks his neck out for a friend; Don receives surprising news.
Roger puts on his entrepreneur hat; Don asserts himself over his colleagues; Sally gets in over her head.
'Tis the season to be jolly, but there isn't much festive cheer to be found at the agency. Harry attempts to help an old friend, while Don and Joan bond.
While Don and the team prepare their pitch for the agency-defining Jaguar account, Joan receives a lucrative offer. Plus, Peggy makes a big decision.
While the company revels in the glory of its successful Jaguar pitch, Lane reaches breaking point. Plus, Sally is reunited with an old friend.
Opportunity is in the air for everyone and Pete meets a stranger on the train.