'Mad Men' Season 4 Recap
In arguably the best episode of the series, 'The Suitcase,' Don and Peggy hash it out over a series of tense scenes after Don makes Peggy stay late to revise the Samsonite campaign, even though it's Peggy's birthday and her family is waiting for her to celebrate. The episode reaches its climax when Don finds out that Anna, the real Don Draper's wife, has died of cancer, and cries in front of Peggy. Don claims that Anna was "the only person in the world who really knew me." To which Peggy says, "That's not true."