Mad Men has always been, among many other things, about the exit of the old guard and the entrance of the new โ€” and the acceleration of that transition by the mood and the movements of the Sixties. The pilot, set in 1960, finds the Sterling Cooper higher-ups scrambling to locate a Jewish employee within their ranks so that he can sit in on a meeting with a potential Jewish client, Rachel Menken (Maggie Siff). โ€œHave we ever hired any Jews?โ€ asks Roger Sterling (John Slattery), whose place at the top was guaranteed to him as a birthright. โ€œNot on my watch!โ€ jokes Don Draper (Jon Hamm), oozing the casual anti-Semitism of the era. Just seven years later, those same men hire a Jewish copywriter, Michael Ginsberg (Ben Feldman) โ€” who in turn becomes psychotically paranoid about being supplanted by the brand-new computer thatโ€™s moved into his office.

The first half of Mad Menโ€™s farewell season ended last May with two unmistakable harbingers of a new dawn: the moon landing and the death of Bert Cooper (Robert Morse), the seriesโ€™ eldest character. But those two events were just the most obvious nodes in a constellation of replacements: of Don by his protรฉgรฉ Peggy Olson (Elisabeth Moss) in the Burger Chef pitch, as well as by new men in the lives of his ex-wives Betty and Megan (January Jones and Jessica Parรฉ). Even his rapidly maturing daughter Sally (Kiernan Shipka) found male attention elsewhere, in the form of an astronomy nerd โ€” as far from Don as a rebellious teen can get. Innocently looming over them all is Ginsbergโ€™s old foe, the IBM machine, which threatens to make obsolete not just the agencyโ€™s employees โ€” โ€œCutler’s not going to stop [shedding staff] until the firm is just Harry and the computer,โ€ complained Roger โ€” but, it would seem, human creativity itself.

The first of Mad Menโ€™s final seven episodes, which will begin airing on April 5, builds on last yearโ€™s theme of replacement and substitution. (The terrifically mysterious and melancholy mid-season premiere was the only episode made available to critics.) Written by series creator Matthew Weiner, โ€œSeveranceโ€ takes as its through-line the question of how to cope after realizing youโ€™ve got little else to do but rest on your laurels. Don pulled a Roger in the fourth season when he rashly wed his much younger secretary, Megan, then took forever to admit to himself that the generational gap between them was too wide for either to make the other happy.

But โ€œSeveranceโ€ finds Don settling in to Rogerโ€™s aging-playboy slippers even further, holding repeat auditions at the now McCann-owned Sterling Cooper to mack on as many models as possible. Donโ€™s a fat, lazy wolf who knows he doesnโ€™t need to hunt; the prey will come to him and sit right on his lap. All heโ€™s gotta do is let them. The only difference between Roger and Don โ€” other than the older manโ€™s Seventies-ready David Crosby walrus ‘stache โ€” is that the erstwhile Dick Whitman now feels free to recount tales about his poverty-stricken childhood while his dates laugh obligingly.

But Peggy Lee wondering โ€œIs that all there is?โ€ on the soundtrack foreshadows Donโ€™s existential hangover. Donโ€™s vision of a singing-and-dancing Bert Cooper last year after the old manโ€™s passing is echoed in โ€œSeveranceโ€ by another hallucination. So much of Mad Menโ€™s run has focused on its protagonistโ€™s striving efforts to get to the top while keeping his shameful past hidden. Now that Donโ€™s reached his destination and been liberated from his secrets โ€” heโ€™s advertising royalty once again and has a new young thing to distract him every night of the week โ€” heโ€™s stuck in a hamster-wheel of hedonism. (Rich-people problems, amirite?)

Donโ€™s fears of death and the futility of his accomplishments are the natural extensions of the showโ€™s meditations on the mid-century American Dream. And yet this is territory the show has already trod over several times with Roger (though Don has maintained a much less dysfunctional relationship with his daughter). The final seven episodes have a lot of character work ahead if the show wants to distinguish Donโ€™s crisis from the ones Roger has already worked through.

Along with mortality, โ€œSeveranceโ€ introduces another quotidian tragedy: that of being stuck in patterns of dissatisfaction and petty vengeance. Recently made partner Pete Campbell (Vincent Kartheiser) is as slappable as ever, whining that the million-dollar payout he got from the McCann deal, when the larger company bought a majority share of Sterling Cooper last year, just created more tax-avoiding headaches for him. But those patterns also prove compellingly heartbreaking when a longtime character is arbitrarily fired (hence the episode title) โ€” and canโ€™t help retaliating in a way that shoots a bullet at his former colleagues and another one straight into his own heart. And, of course, institutional social change canโ€™t come quickly enough for Peggy and Joan (Christina Hendricks), two professionally ascendant pioneers who are reduced to an ugly duckling and a pair of breasts by neanderthals from McCann. After a meeting goes awry, the two women passive-aggressively snipe at each other just as they did in Season 1, divided and conquered by men once more.

Though sheโ€™s encountered a few setbacks in getting out from under Donโ€™s shadow, Peggy is, of course, the natural heir of the new era. We learn in โ€œSeveranceโ€ that sheโ€™s been so busy as a trailblazer, which has meant many long and lonely nights at the office, that sheโ€™s never had the opportunity to travel abroad. After a blind date goes surprisingly well, she attempts a spur-of-the-moment trip to Paris with her new lover, but canโ€™t find her passport. Whether sheโ€™ll be able to make that trip โ€” and thus break out of the rut sheโ€™s forced herself into to get so far at the office โ€” will reveal whether she is aspiring to be just another suit in a gray-flannel skirt โ€” or something more. Don may not be able to adapt to a new world as the Sixties come to an end, but Peggy sure can.

Inkoo Kang is the TV Critic for the Village Voice. She publishes widely on film and television and tweets at @thinkovision.

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Inkoo Kang is a regular film contributor at Voice Media Group. VMG publications include Denver Westword, Miami New Times, Phoenix New Times, Dallas Observer, Houston Press and New Times Broward-Palm Beach.