There are no words to describe how remarkable this episode was. "The Suitcase" was like watching a really good one-act play. It is probably the most important episode for Don & Peggy lovers. But mostly it showed the most emotional I have ever seen in Don Draper over the course of 50 minutes. They started out as a stern father chastising his teenager daughter (complete with very loud stomping and muttering under her breath, by Peggy). Don steps back into mentor-mode by telling her to she'll know a good one when she sees it and to keep banging them out until that happens. Eventually, they devolve into the immature, idiot boyfriend whining about not being able to read his passive-aggressive girlfriend's mind. On her birthday, Peggy vacillated between attending to her boss' demands and spending a romantic evening with her boyfriend (and her family?!). In the end, she makes her choice...and, of course, it's Don. Bye, bye to Mr. Dopey Whathisface! After Don yells at her over her failure to provide a good ad idea, Peggy breaks down in tears and runs off to sulk. Meanwhile, Don discovers Roger's memoir tapes (which reveal Miss Blankenship was a sexpot and Bert Cooper is ball-less. Don realizes some of his tension is because he is waiting to hear about Anna's death. He calls Peggy back into his office and plays her the tapes, over which they giggle like schoolgirls. He can't be alone, so he invites Peggy out for dinner and drinks, like a couple of buddies. Don lets Peggy ramble on about her resentment over how men look and treat her like she's unattractive. Ever the supportive "girlfriend," Don tells her not to worry because she's a cutie. Peggy reveals that everyone think that they've slept together and that her mother thinks he's her baby's daddy. When Don denies that he would ever cross that line, she tacitly reminds him of his indiscretion with Allison. He asks her if she knows who the father is, and Peggy responds that she does and that at times it's difficult to think about the baby (I should mention that she had had a charming interaction with the very pregnant Mrs. Pete Campbell earlier that day). They return to the office, and Peggy helps Don to the men's room, as he dangerously needs to vomit. She steps out upon hearing a drunken Duck calling out to her. While accusing Don also sleeping with Peggy, Duck reveals that he and Peggy "were in love." Don is horrified (no doubt because he now thinks Duck is Peggy's baby's daddy) and drunkenly attempts to defend Peggy's honor. They both fall to the floor, as Don softly cries "uncle" in the face of Duck's 17 kills at Okinawa (a subtle dig on Don's own cowardice in Korea). Once again, Peggy cuts loose another man in her life in favor of Don. Like an old married couple, Don and Peggy fall asleep in his office with Don's head in her lap. Don is briefly stirred when Anna's ghost comes to say goodbye and marvel at his office. In the morning, Don confirms her death and breaks down in tears, like a little boy. With awkward maternal concern, Peggy consoles him. Don decides to regain his paternal position and sends her home to bed. Peggy, unwilling to completely let go, passes out in her office. A mess upon waking, Peggy opts to check in on the now spiffy Don. They discuss his idea about the campaign, with Peggy briefly comfortable enough to criticize it. But she quickly backs off, expressing her fatigue. Don, fully back to Father Knows Best-mode, pats her on the head and sends her home to freshen up. Don is back to himself with nothing to hide, so she leaves the door open as she goes.
There were moments when the emotions were so big, that I feared they would really cross that line. Thankfully, the writers were truly out to reflect on the sanctity of the Don & Peggy relationship and why it works so well. Don cries that Anna is the only person who really knew him, but Peggy quietly tells him that she's not. Peggy may not know everything about Don's past (although he did reveal a little about Dick Whitman to her), she does see him for who he is.