Peggy (who's still on the show!) is at her new agency, where she's got to learn to smoke "the lady's cigarette," as she's on what appears to be the Virginia Slims account. "You're a woman and you smoke: What do you want?" her boss asks.
Back at the Draper household, the person who's been calling and hanging up all day turns out to be Roger looking for Marie. He asks her to come over; she agrees, if he'll "lower his expectations." (When she gets there, he wants her to take LSD, though she refuses, telling him to please not ask her to take care of him.)
Megan, following her unsatisfactory conversation with Don, goes to take a bath and cries in front of the mirror. (Remember her "fake crying" practice earlier in the season?) When her mother comes in in the morning, Megan tells her "I’m sad." Marie's response: "Stop feeling sorry for yourself. You have a husband who provides for you even though you won’t give him a family...Not every girl gets to do what they want. The world can’t suport that many ballerinas."
In the agency, Don wanders around with his toothache, asking for Dawn for ice, talking to Joan, and then going to visit Lane's wife, where he offers his condolences and she tells him, stiffly, "We're not ones to wallow." But she has not forgiven, saying, “You had no right to fill a man like that with ambition," and then confronts Don with the photo of the girl that Lane had stolen from the wallet he found in the cab earlier in the season, a girl he never even met. "Don’t leave here thinking that you’ve done anything for anyone but yourself,” she tells Don.
Elsewhere in the world of not-domestic bliss, Pete gets home and Trudy is feeding the baby; she points to a design for a pool in their back yard, his tiny illustrated figure in the drawing—"That's you." Pete says, "Tammy could drown!" and Trudy explodes, "This gloom and doom, I'm tired of it!" In the city, Megan and Don's situation is spiraling as well. He comes home and she's drunk, her mother gone, and confronts him with what might be both of their deepest fears: "This is what you want, for me to be waiting for you? That’s why you won’t give me a chance. It’s either that or I’m terrible.” (Later, we see Don watching her screen test: Does he thinks he's terrible? He smiles, then he seems to frown.) When Don leaves Megan to sleep, Marie has returned, who tells him of her daughter, "This is what happens when you have the artistic temperament and you are not an artist. Nurse her through this defeat"—and he'll have the life he wants. But what life does Don actually want?
And then, a string of phantoms: Don's tooth is pulled, and in the pulling, suddenly he sees Adam as his dentist: "I wanted to do you a favor and take it out, but it’s not your tooth that’s rotten," says his brother. Pete goes to see Beth in the hospital, claiming to be her brother; she says she doesn't have a brother. When he realizes she doesn't remember him at all, he pretends to be there to see a friend who's been involved with another man's wife, which put in him the hospital. "He needed to feel that all this aging was worth something, that he knew something....When it went away he was heartbroken and he realized everything he had was not right either, and that was why it had happened at all...his life with his family was some temporary bandage on a permanent wound," he explains, of this "friend." Beth, in her gray cloud, says "Don’t worry, they’ll fix him up here."