SCDP is shopping a public offering to underwriters, and Joan is blown away that her net worth might soon be in the seven figures. The only potential hurdle is Don, but although the valuation goes well and Pete is confident that Don's tired of playing bush-league ball, it's still hard not to hold your breath in anticipation of Don messing it up for everyone.

Let's come back to that, though. Roger is mining his new piece of tail "Daisy," a first-class airline stewardess, for client leads -- which means he rushes to the airport when a flight is delayed to get a very-much-carefully-selected dude drunk in the hopes of pitching him business. It's pretty great stuff, seeing Roger behave like a hungry Accounts guy when, not even to his knowledge, the company needs him the most. Also, it's Mother's Day, and with Marie in town, Megan confesses that she and Don have grown apart. Marie guesses that Don's jealous of Megan's newfound relationship with her adoring fans, and as such counsels her to dress impossibly sexy. As temporary fixes go, it's fairly successful, although Marie probably regrets her advice when she has to listen to her daughter's moans of ecstasy from the next room.

Pete and Benson go to one of those houses in which Don grew up and have a fantastically awkward run-in with Pete's father-in-law Tom, of, you'll remember, Vick Chemical. Ken tells him there won't be an issue, as Tom doing anything to Pete would ensure his own destruction, but Tom actually does end up yanking Vick Chemical's business, calling Pete a lowlife for good measure. Pete proves this by running to Trudy and telling her about her dad's indiscretion, and she reacts by informing him they're officially done. It's the course she should have chosen in the first place, but it's nice that now she really has no reason to doubt herself.

Herb Rennet calls a dinner with Don and Roger to straighten things out from the "fiasco" a couple episodes ago, and when Roger hears that Marie's in town, he gets his hopes up for some under-the-table head. However, his errand at the airport renders him unable to attend, and without him the dinner is an unmitigated disaster – Marie, already furious with Roger, can't stand the vacuous babbling of Rennet's genial but clueless wife and starts drinking like Canada's gone dry. Then, when Don and Herb get a moment alone, Herb advances the suggestion that an associate of his vet Don's work from now on, and Don reacts, much as you'd expect, by telling Herb to shove it. The account is irreparably fractured, and this leads to a screaming fight the next day in front of the whole staff in which Pete reveals what happened, and when Joan hears that Don single-handedly canned Jaguar, thus rendering the fruits of her, um, labor largely irrelevant, she lights into Don like no one since Betty ever has.

The saving grace of all this is that the man Roger followed to Detroit is from Chevrolet, and he brings SCDP into a very small competition for their business. What no one at SCDP knows is that CGC is as desperate as they are – not only did they recently dump their own car account in Alfa Romeo, Chaough also finds out that Gleason, the third partner and apparently the art director, has pancreatic cancer, and with the money that would come to him upon his death, he could cripple the company financially – unless their pitch to Chevrolet comes to fruition. I also read that look from last week correctly, as Chaough ends up kissing Peggy, but although she kind of rebukes him, she looks very flattered at the very least, although he's too embarrassed and upset about Gleason to notice. Also, in the time since last episode, Peggy apparently went ahead and bought a place on the UWS, but she's in over her head, both with the needed renovations that seem too much for Abe to handle and the fact that the neighborhood isn't gentrified enough for her. Good thing she's having fantasies where Abe is Chaough, I guess.

Unable to sleep in Detroit, Don goes down to the bar, where Chaough is dismayed to see him, because he's sure GM/Chevrolet is going to take their small-agency creative ideas and give them to one of the bigdogs. Don comes to see things Chaough's way, and I swear the word "merger" came into my head like a lightning bolt right about three minutes before the two of them go rogue and decide to pitch Chevy on the idea of combining their agencies to service the account. Roger and Cutler sign off on the idea, and when Peggy dolls herself up and steps into Chaough's office to see him on his return, her chin falls somewhere beyond the floor when she finds Don with him – they landed the account, and the two companies have merged. So Peggy is the copy chief at one of the top 25 ad agencies in the country and is tasked with coming up with the place's new name "for immediate release." It's just not the immediate release she was hoping for, AM I RIGHT?