Don attempts to return to his advertising agency after being put on indefinite leave following a meltdown in the middle of a client meeting. Eventually, his status at the firm becomes the focus of a bitter power struggle between Roger and Jim, both of whom want to take Sterling Cooper & Partners in radically different directions. The highly anticipated series conclusion will, for the last time, follow the complex lives of Don, Peggy, Roger, Joan, Betty and Pete as their stories come to an end. It's the End of an Era.