Watch it

“American Idol” (8 p.m., Fox). Ehhh, there’s nothing else on, so why not? Tonight is the final performance for Crystal Bowersox and Lee DeWyze. I’ve been underwhelmed by both of them; they both over-sing too much.

“Glee” (9 p.m., Fox). It’s a special Lady Gaga-centric episode. Looks weird. But catchy, at least.

“Justified” (10 p.m., FX). Raylan vows to put an end to Boyd’s new vigilante tactics. Ooooh, sounds like a showdown’s a-brewin’.

Of local interest

“Biggest Loser” (8 p.m., NBC). Can Rohnert Park’s Sam & Koli win it all? Find out tonight in the season finale.

Record it

“Deadliest Catch” (9 p.m., Discovery). An ice storm hits, and there’s trouble for Captain Phil when his ship runs aground. Gotta say, it’s been weird watching him this season knowing he died just weeks later.

“Parenthood” (10 p.m., NBC). It’s the season finale, with the Zeek trying to reconcile with Camille.

Skip it

“Dancing With the Stars” (9 p.m., ABC). A two-hour finale seems excessive. Oooh, and Vienna joins the show to dance with Jake.