Remember What You Were Watching in Summer 2010? We Bet It Was One of These 12 TV Shows

The acclaimed drama aired its fourth season in starting in July 2010. In what would be another Emmy-winning season, the show mainly covered the fallout from Don's divorce. It also featured what would become a fan- and critic-favorite episode, "The Suitcase," which put Don and Peggy's fracturing professional relationship and friendship at the center.