Fans of NBC's "Revolution" (10 p.m., NBC10) should be happy the network has already announced its renewal for Season 2, because recent ratings have been anything but revolutionary.
Remember that old advisory, "If you love something, let it go"? That doesn't work for TV, guys. If you love something and fail to show up for it on a regular basis, sooner or later, someone else will let it go. (And if the lights go off in real life, they're unlikely to come back on.)
Don't care if NBC's feeling queasy about bringing back "Revolution"? You may also want to check out (or DVR, since they're on at the same time):
-- "Castle" (10 p.m., 6 ABC). In the next-to-the-last episode of the season, Castle (Nathan Fillion) and Beckett (Stana Katic) work a case involving Homeland Security.
-- "Rectify" (10 p.m., Sundance Channel). The spring's best new drama -- about a man experiencing his first week of freedom after 19 years on Death Row -- continues with an episode, "Plato's Cave," in which Daniel (Aden Young) learns that it's not so simple to just go shopping with his mother. And if you're a fan of not-so-simple, Sundance is showing "The Usual Suspects" (1995) beginning at 8:15.