Mad Men (10pm, AMC) - At long last, the first part of the final season of “Mad Men” returns tonight (seven episodes now and the final seven next year), with the usual cryptic plot clues available for dissemination: Don makes a new friend, Joan meets a client for drinks, Peggy hears some impressive new work and Roger experiences a strange phone call. (Hint: The first and third of those items turn out to be the most interesting.) Vague or not, we know we’re all tuning in.
Also on tonight . . .