“Mad Men” returns for a third season on AMC. What will the new season bring on the heels of season two? Find out on August 16. We left the cast amid many changes, including the Cuban Missile Crisis, a takeover of the Sterling Cooper advertising agency, and news of a third Draper baby. All this and Pete (Vincent Kartheiser) professes his love for Peggy (Elisabeth Moss), but she confesses that she secretly gave birth to his child only to give it up for adoption in order to pursue her career. And self-indulgent Roger (John Slattery) left his wife for Don’s former secretary Jane.