After a long hiatus Mad men returns to find Don married to his secretary, who now works with Peggy in the creative dept. Joan gives birth to a son (the father being Roger Sterling) although her husband believes it is his baby. Megan, Don's wife, throws a surprise party for his 40th. birthday and does a special song and dance for him which he doesn't appreciate too much. The ex Mrs, Draper doesn't appear at all, but maybe she will surprise us in the next episode.