Watch it

“30 Rock” (8:30 p.m., NBC). This is possibly the coolest thing you’ll see all week that doesn’t include a baseball field or Chilean miners: A live broadcast of “30 Rock.” And yes, there will be two versions, one for the East Coast and one for the West Coast. Tonight, it’s Liz’s 40th birthday and everyone forgets.

“Fringe” (9 p.m., Fox). Back in normal Earth, the freaky Thomas Jerome Newton activates a shape-shifter, which puts Bolivia in danger of being exposed as being from the alt-universe.

“It’s Always Sunny in Philadelphia” (10 p.m., FX). The gang tries to spiff up an abandoned pool after they’re kicked out of a poll club during a heat wave.

“The League” (10:30 p.m., FX). Andre and Pete train for a marathon. Because they’re 30-something cliches. Meanwhile, Taco finds a new career. Or more accurately, a career.

Record it

“The Office” (9 p.m., NBC). There’s good news and bad news: Michael thinks he has herpes (ew) so he contacts all his former girlfriends (yay). So look for guest spots from Amy Ryan (Holly), Melora Hardin (Jan), Nancy Walls Carrell (Carol) and more.

“Project Runway” (9 p.m., Lifetime). The designers spend an evening in a luxurious penthouse, then they get their last task before Fashion Week.

“Late Night with Jimmy Fallon” (12:35 a.m., NBC). Musical guests Ben Folds and Nick Hornby (the author). That should be an interesting collaboration.

Skip it

“The Apprentice” (10 p.m., NBC). Does anyone else feel dirty watching about a show that’s about firing people in the midst of a Great Recession and the worst job market of a generation? Or is it just me?

“Kick Off Cook Off” (10 and 10:30 p.m., TLC). One of the cooks threw up after tasting her own food last week. This is no “Top Chef.”