S4E11 · Chinese Wall

Complete story — includes the ending

When word leaks of Lucky Strike's defection to BBDO, Don charges the employees of SCDP to protect their existing businesses, as well as attempt to find new clients. Roger, who has been hiding the loss, fakes an angry phone call to Lee, and lies to the rest of the firm about going to Raleigh to try to win back the account. In the midst of the turmoil, Roger turns to Joan for comfort; she admonishes Roger that they cannot resume their affair. Stan kisses Peggy, who is nervous about her upcoming meeting with Playtex; Peggy tells Stan that Abe, whom she has had sex with, is her boyfriend. While waiting for Trudy to give birth to their daughter, Pete is wooed by Ted Chaough at CGC. Megan shows interest in both Don and the advertising business, and opens up to Don about her early life, revealing that she came to New York to be an actress. They proceed to have sex in Don's office. Roger returns to the office, claiming that Lucky Strike has defected as part of American Tobacco 's cost-saving consolidation of accounts. Although some clients jump ship, such as Glo-Coat, most clients ultimately decide to stay at SCDP.