S7E4 · The Monolith

Complete story — includes the ending

At dinner with his girlfriend Bonnie, Pete encounters a former Vicks colleague who informs him that his father-in-law has suffered a heart attack, making Pete realize how distant he has grown from Trudy. Don moves into Lane's former office, haunted with guilt over Lane's death; he briefly discards a New York Mets pennant, but later decides to hang it in tribute. Roger learns his daughter Margaret—now calling herself "Marigold"—has joined a hippie commune; he and Mona visit, but Margaret refuses to return, citing Roger's past neglect as justification for abandoning her own maternal duties. Cutler installs an IBM computer in the creative lounge; Don befriends the installer and urges Bert to pursue the company as a client, but Bert reminds him he cannot seek business without partner approval. Pete discovers Burger Chef is reviewing McCann Erickson; the partners assign Don to the account over Lou's objections, and Lou puts Peggy in charge with a raise, hoping she or Don will fail. Peggy assigns Don and Mathis 25 taglines each; Don initially drinks and escapes with Freddy's help, but after Freddy rebukes him, he returns sober and begins producing taglines.