The second season opens with Don butting heads about personnel matters with Duck, who wants "younger creative talent"; the staff is up in the air about its approach to an airline-company account; Betty bumps into a former roommate who has begun a surprising new career; Joan is at a loss about where to put the new copy machine.

Problems surface on the set of a commercial shoot while Don plays hooky from the office; ever-ambitious, career-minded Harry musters support for a sponsorship plagued by controversy; Betty steps in to help Don when he arranges a dinner to placate his upset clients.