The Olyphant in the room is a thieving salesman. Timothy Olyphant (Deadwood, Justified) begins a guest-star arc as a formidable competing salesman who begins stealing Dunder Mifflin's prized clients. The con is on when Michael joins forces with Jim and Dwight to set up an elaborate, shadowy sting in an effort to unearth the pilferer's sales secrets. Meanwhile, Andy, sing-songy vocalist-wannabe that he is, decides to start a band after getting wind of his college pal's successful music career. — Dean Maurer
Are you watching The Office tonight? Tell us now!
Night of Too Many Stars: An Overbooked Concert for Autism Education
9/8c Comedy Central
Laughter may be the best medicine, but leaving people in stitches can also separate them from their money for a good cause. Jon Stewart hosts this biennial fund-raiser that benefits autism education and family-service programs across the country. The long list of performers at New York City's Beacon Theatre includes Lewis Black, Steve Carell, Stephen Colbert, Tina Fey, Jim Gaffigan, Ricky Gervais, Tracy Morgan and Sarah Silverman, and Sharon Jones and the Dap Kings are the evening's house band. — Joe Friedrich
The thread of Season 8 episodes begins unspooling to its end in Part 1 of the two-part finale. The Big Apple inspired the clothiers last week, yet young April didn't have a New York state of mind and was ousted, leaving the final fab four — Michael C., Mondo, Andy and Gretchen — to battle it out for Fashion Week honors. Now they're under the Gunn. Tonight, mentor Tim Gunn visits them in their hometowns to review the progress of their collections, but evidently they're not making it work. The usually agreeable Gunn must be cruel to be kind, criticizing their work as "a truly hot mess" and a "teen's pajama." Could it be coming apart at the seams for our finalists? — Dean Maurer
What are you watching tonight? Tell us now!
CSI: Crime Scene Investigation
Where's Niecy Nash and her Clean House crew when you need them? Tonight, the CSIs stumble upon one of the messiest homes in the country when a dead body is discovered underneath piles of trash and debris in a criminally cluttered house. The owner suffers from a condition called "hoarding"...and becomes the chief suspect in the murder investigation. — Tim Holland
There has been no shortage of fist pumps or fistfights on the second season of this smash hit that you either hate to love or love to hate. Season 2 wraps up tonight, but not before the tanned and toned housemates squeeze in one final blowout fight, and this time, even the normally good-natured Pauly D. gets into it. — Karen Andzejewicz
Is Jersey Shore appointment viewing in your house? Tell us about it
The Big Bang Theory
And we were just getting used to "Shamy!" Granted, Sheldon with a girlfriend, played by Mayim Bialik, was hard enough to imagine, but even harder is Sheldon being in the position of dumping a girlfriend. Tonight, Sheldon moves into the inevitable meet-the parents stage of his relationship when he meets Amy's mom, but as he reaches this new level, he also realizes that he no longer wants to see Amy. It looks like this bud of love isn't going to blossom. — Bill Ecklund
It's Always Sunny in Philadelphia
Charlie's mom (Lynne Marie Stewart) is sweet while Mac's mom (Sandy Martin) is surly. She also smokes, and Charlie's fastidious mom can't stand smoke. On this show, that makes them perfect roommate candidates. The reason why they're moving in together, by the way, is because Mac's mom burned her house down smoking. Meanwhile, an ailing Dee is desperate to get better in time for an upcoming Josh Groban concert ("I'm a Grobanite"). So Frank volunteers to nurse her back to health. Don't think that he's doing it just because he's a doting dad. — Paul Droesch