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Best: Peggy and Ted's slow-burning office flirtation
Key episodes: "The Doorway" (601/602); "The Flood" (605); "For Immediate Release" (606); "The Better Half" (609); "The Quality of Mercy" (612); "In Care Of" (613)
A stray kiss here, a stolen glance there. Peggy and Ted's forbidden romance may have heated up faster if it wasn't for the merger and Don's subsequent rivalry with Ted. It finally came to a head in the season finale, when Ted and Peggy gave into their attraction ... and Ted immediately decided he needed to get far, far away. We don't know whether to commend Ted for sticking by his family, condemn him for giving Peggy false hope, or congratulate him for convincing Don to let him to go California. Whatever the answer, we're just glad Peggy got Don's office.