Don receives a breach of contract letter. Megan and Don break up. Cooper dies. The partners decide to sell SC&P to McCann Erickson.
Don helps Peggy with a Burger Chef strategy. Bob Benson proposes to Joan and reveals Chevy is leaving. Harry is voted in as a partner.
Peggy mistakes Shirley's roses for her own. Pete brings in new Chevy business. Don tells Sally he was put on leave. Joan is promoted.
Stan finds Lou's cartoon. Stephanie calls Don for help. Harry warns Don about Commander cigarettes. Ginsberg has a breakdown.
SC&P installs a computer. Roger visits Margaret at a commune upstate. Peggy is assigned the Burger Chef account. Don gets drunk.
Don tells Megan he was put on leave. Megan kicks Don out. Betty visits a farm with Bobby. Don returns to SC&P.
Don visits Megan in Los Angeles. Joan saves the Butler Footwear account. Peggy has difficulty with the Accutron tagline.