5 of 19
Worst: The mystery of Dawn Chambers
Episode: "To Have and To Hold" (604)
For one brief moment it looked like the show might be opening the door to a whole new world when "To Have and To Hold" followed Don's secretary, Dawn, out of the office and into her personal life. But just as quickly as it opened, that door closed. We don't blame the show for the difficulty of balancing so many characters (we don't see a whole lot of Ginsberg, Harry or Henry Francis either), but we're hoping to see even more from Dawn next season.