Don gets a Christmas letter from Sally which highlights his loneliness. Now 18 months sober, Freddy Rumsen turns up at SCDP with a new client, but h
is chauvinism leads to conflict with Peggy. Roger mistakenly invites Lee Garner, Jr. to the firm's Christmas party, forcing Lane to expand the party's budget beyond their means. Sally receives some awkward attention from a classmate. Don has a drunken one-night stand which affects a work relationship.