(ALL TIMES ET)

9PM | NBC
The Office – Stephen Collins and Dee Wallace guest star as Andy’s ‘rents, while Josh Groban guests as his brother, and their family reunion provides so much insight into why Andy is so … Andy.

8PM | CBS
Big Bang Theory – Wil Wheaton guest stars when Leonard and Shelton attend a soiree at his house.

8PM | NBC
Community – New roomies Troy and Abed host a housewarming, er, apartment warming, party.

8:30PM | NBC
Parks and Recreation – It’s dueling camping trips when Ron takes the Pawnee Rangers boys into the wild, while Leslie does the same with her all-girls troop of Pawnee Goddesses.

9PM | LIFETIME
Project Runway – Zoe Saldana is the guest judge as we get close to the season finale and the remaining designers are challenged to create a mini collection.

10PM | FX
It’s Always Sunny in Philadelphia – It’s a family reunion when Frank’s brother shows up and reveals some family secrets, including the woman who came between the Reynolds brothers.

10PM | CBS
The Mentalist – Jane thinks a dude at a political rally is about to commit a murder. And considering said dude has a gun, he might be onto something.

10:30PM | FX
The League – Ruxin tries to get Geoffrey into a Jewish preschool.

Worth flipping to during commercials:
– On Vampire Diaries (8PM, The CW), Damon tries to get Jeremy to help take out the dangerous Klaus;
– The contestants pay home visits to the judges/mentors on The X Factor (8PM, Fox);
– Debbie Allen guests as Jackson’s mommy on Grey’s Anatomy (9PM, ABC);
– A young doctor is on the guys’ list on Person of Interest (9PM, CBS);
– The Situation takes his pot stirring too far and the whole house turns against him on Jersey Shore (10PM, MTV);
– A woman with no uterus wants to have a baby on Private Practice (10PM, ABC).

And the late-night line-up:
– Conan (11PM, TBS): Sarah Michelle Gellar;
– The Daily Show with Jon Stewart (11PM, Comedy Central): Bill O’Reilly (REPEAT);
– The Colbert Report (11:30PM, Comedy Central): Ken Burns (REPEAT);
– The Late Show with David Letterman (11:35PM, CBS): Bill O’Reilly;
– The Tonight Show with Jay Leno (11:35PM, NBC): Zachary Levi;
– Jimmy Kimmel Live (12:05AM, ABC): John Goodman;
– Late Night with Jimmy Fallon (12:35AM, NBC): Julianne Hough;
– The Late Late Show with Craig Ferguson (12:37AM, CBS): Kathy Bates;
– Last Call with Carson Daly (1:35AM, NBC): Chris  Hayes.

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• Filed in It's Always Sunny in Philadelphia, Late Night, Project Runway, The Office, TV Picks
• Tags: Big Bang Theory Wil Wheaton, The Office Josh Groban