Dr. Alvin Wayne causes panic after walking in on the wrong day for a procedure he will assist in. Everybody wonders if his cognitive skills need checking. After swimmer has a seizure an interesting diagnosis is found.Tina needs help with a procedure and Sidney may get in trouble after a doctor misses a diagnosis in a former patientmoreless
When a man dies from poisoning after eating breakfast in the Division 1 Cafe, Jane and the team search for the source. Korsak meets up with one of his ex-wives. Tommy wants proof that he's the biological father when Lydia returns to take back the baby.moreless
Opportunity is in the air for everyone and Pete meets a stranger on the train.
Roger puts on his entrepreneur hat; Don asserts himself over his colleagues; Sally gets in over her head.
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.
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.moreless
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.