TONIGHT'S MUST-SEE

"I Love the New Millennium," 6 p.m., VH1; continues nightly. Nostalgia is rushing at us faster now. On Thursday's finale, we'll reminisce about 2007. As usual, there are lots of quips (Michael Ian Black is especially good) and clips. Tonight, people speak fondly of "Zoolander" and post-9/ll unity. They ponder "Who Let the Dogs Out?" ("eight years later and we still don't know the answer") and more. Gilbert Gottfried eyes "Moulin Rouge" warily: "The director (said), 'Can we do that again, but make it a lot more gay?' "

"The Bachelorette," 7 p.m., ABC. DeAnna Pappas visits the homes of the final four guys. Then she trims to the three guys whom she'll invited on overnight dates next week. We're guessing they'll say yes.

OF NOTE

"Big Bang Theory," 7 p.m., CBS. Here's the rerun of an exceptionally funny episode. Desperate to avoid hearing Penny's awful singing voice, Sheldon lies. The lie soon grows.

"Middleman," 8 p.m., ABC Family. When last week's fun opener began, Wendy Watson was a low-key artist and receptionist. Tonight, she descends into the underworld, to stop the Earth from being barraged by fire.

"How I Met Your Mother," 7:30 p.m., CBS. The friends share memories linked to Marshall's car, which is in the shop.

"Nashville Star," 8 p.m., NBC. Last week was so-so, partly because songs were scrunched into an absurd, 70-second time limit. Tonight, the 10 surviving acts each tackle a pop song.

"The Lost Pyramid," 6 p.m., History Channel. Alongside the three Great Pyramids of Gaza, historians feel, there was once a fourth. Here's an interesting, revisionist look at its remains and the emperor who built it, more than 4,000 years ago.