S5E9 · Dark Shadows

Complete story — includes the ending

While helping Sally on a family tree project, Betty becomes jealous upon finding a love note Don has written to Megan and passive-aggressively tells Sally about Anna. Don is furious at Betty for telling Sally, but Megan tells him to let it go, pointing out that Betty just wants to ruin their marriage from afar. Sally overhears their conversation, and to get back at her mother, acts as if the revelation meant nothing. Pete continues to resent that his brief affair has ended with Beth. Roger agrees to buy Jane a new apartment, free of old memories, in exchange for her help wooing Manischewitz executives. Jane and Roger have sex in her new apartment; the next morning, Jane sadly tells Roger he has ruined the apartment for her. While working on the Sno Ball account, Don covertly looks through Ginsberg's private work and realizes that Ginsberg's ideas are better than his own. The creative team agrees to pitch both Don and Ginsberg's ideas to the Sno Ball executives, but Don purposely leaves Ginsberg's ideas behind in the taxi cab before the meeting. The presentation is successful, but Ginsberg is enraged by the act of sabotage and confronts Don.