A new trailer for Season 6 of AMC's critically-acclaimed series Mad Men features series star Jon Hamm as Don Draper, debating the merits of whether or not it's truly important to be happy. Check out the latest footage before the new season debuts with the two-hour premiere, "The Doorway, Part 1" and "The Doorway, Part 2" on Sunday, April 7 at 9 PM ET on AMC. The series returns to its regular Sunday 9 PM ET time slot on April 14 with "The Collaborators", an episode which was directed by Jon Hamm.