Peggy contributes on a church project; Duck and Don try to create market appeal for a foreign beer brand; Harry recruits assistance to help with the workload in his department.

Don meets up with an old friend; Pete's personal life presents problems; Joan brings her boyfriend to the office.

The writers make an attempt to stave off late-night boredom during a mandatory overtime session. Roger throws a party as Joan and Greg host their own party. Sally has a run-in with Grandpa.

Sterling Cooper receives a surprise visitor; Sally has been spooked by something (or someone); and Joan receives some shocking news.

A former client makes a return; Betty and her kids go on a trip; and Joan and Greg make plans for their future.

Don takes a trip. Joan has scheduling problems. Don and Lane get to know each other a little better.

Joan and Peggy deal with high-jinx in the office.

Don and Peggy are faced with life-altering decisions.

Don has an encounter with someone from the past. Meanwhile, Roger increases Peggy's workload, and Joan comes to a momentous decision.