A former Independence soldier who had served with Mal and Zoë returns in a dramatic manner, with a vicious Alliance officer chasing after him for some unusual smuggled goods.

With his personal and professional life crumbling around him, Don positions himself for a change of scenery. Meanwhile, Pete’s life is falling apart as well, thanks to the meddling of…

The creative department has a wild, drug-influenced weekend as they work on the Chevy account, Don has trouble letting go of Sylvia, and Sally walks in on an unwelcome intruder.

While Don continues his affair with Sylvia, Pete’s latest infidelity threatens his marriage. Meanwhile, Peggy’s icy relationship with her new staff continues, but she also gets an unlikely tip on…

On election night, the Sterling Cooper staff pulls a rowdy all-nighter while watching the returns. Pete’s ambitions cause him to directly challenge Don. Don remembers his past as a soldier…

Roger joins Don for an evening of dinner and drinking, during which Roger’s behavior leads to a rift in their friendship. Though Don accepts his apology, there are further consequences…

A taboo office romance is revealed. At a brainstorming session, Peggy proves to be more than a secretary, opening up new opportunities for her at Sterling Cooper. Meanwhile, Rachel faces…