Don gets a Christmas letter from Sally which highlights his depression. Freddy Rumsen returns to SCDP with a new client, but his 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. Sally receives some awkward attention from a classmate. Don gets drunk and has an ill-advised one-night stand. This episode takes place right before Christmas, 1964.