Don has a toothache that brings up painful memories of his brother as the firm looks to expand after a profitable quarter with Joan running the books. Roger seeks to expand the affair with Megan's mother and asks her to join him on a second LSD trip. Pete has a "last" encounter with Beth and finds she is receiving shock treatment. Megan struggles to find acting work and asks for Don's help getting an audition for a commercial at the agency to jump-start her career. Peggy is adjusting to her new agency and enjoying the challenge of an upcoming campaign bid for Virginia Slims, but still seeks Don's approval.