10 pm/ET AMC
Season 4 opens with an Advertising Age reporter trying to find out just "Who is Don Draper?" Unfortunately for the scribe and the "scrappy upstart" firm of Sterling Cooper Draper Pryce, who hope that this promotional story would generate a rash of business, the secretive Mr. Draper spills no beans. Still, there is plenty going on in this involving episode as Pete and Peggy hire actors to stage a food fight over a meat company's product; and Don admonishes a prudish swimsuit manufacturer that his company can be "comfortable and dead, or risky and possibly rich." And on the ex-homefront, Don issues Betty an unsettling ultimatum. — Ray Stackhouse
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9 pm/ET ABC While this summer hit is already slated for a second season, its rookies — in their rookie season — have been making their share of mistakes on the job. Tonight, squad members are tested by a home invasion in a posh neighborhood, and officers reveal quite a bit about their off-duty lives. And once it seems like the smoke has cleared, Traci leaves to take care of a personal matter, and Andy winds up facing an armed perpetrator by herself. Let's hope she remembered to load her gun this time. — Fred Mitchell
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Pretty Little Liars
8 pm/ET ABC FAMILY
Sara Shepherd, the author of the book series this show is based on, steps into the world she created when she guest stars as a substitute teacher. And that world continues to be full of secrets and tension as the girls deal with the ramifications of everything that occurred during last week's tumultuous homecoming dance, including something they discovered about Toby that night. Meanwhile, Aria is now getting troubling text messages from someone else in addition to "A." — Jennifer Sankowski
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Aaron Douglas stars in this Canadian-imported drama as dedicated cop Frank Leo, who becomes the police union's leader after he stages a walkout to protest the department's ill treatment of his fellow officers. While he continues to take down criminals on the street, Frank's biggest battles are internal with his own superiors and with the men in blue he represents, who aren't always law-abiding citizens.
Read on for previews of the Tour de France, the World Cup, Housecat Housecall, Doctor Who, Suze Orman Show and Secrets of the Mountain.
If Spock died in the second Star Trek film and came back to life in the third, and if David Tennant's Dr. Who can "die" and come back as Matt Smith, surely Artie (Saul Rubinek) could've found something in the warehouse to let him survive the inferno that consumed him at the end of the first-season finale. Right? And while we're throwing around sci-fi luminaries, it's worth mentioning that an author who helped to establish the genre turns up in tonight's second-season launch.
Read on for previews of the Tour de France, America's Got Talent, Law & Order: Criminal Intent, Rescue Me, The Last Lion of Liuwa and P.O.V..