Coming off a polarizing episode of Mad Men, which dedicated a chunk of screen time to the newly chunky Betty Draper, this AMC drama will move ahead with season five on Sunday "Mystery Date."

What can viewers expect? Don running into someone from his past; Joan arriving at a major decision; and more interaction between Roger and Peggy, as the former increases the latter's workload.

Check out the official trailer now and, as always, return to TV Fanatic soon after the installment ends for our latest Mad Men review:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.