Neve Campbell, Jon Hamm

As the first half of the final season of Mad Men nears its end, Don deals with a visitor from his past — are you thinking what we're thinking?

Also in the episode, Stan embarrasses one of his bosses, Harry Crane makes a new ally and Peggy works with Ginsberg.

Get more scoop on why you should watch Mad Men in Watch This Tonight:

Mad Men airs on Sundays at 10/9c on AMC.