'V' season finale; Kathy Griffin on 'Glee' TV Highlights: 'V' season finale; Kathy Griffin on 'Glee' Tuesday, March 15, 2011; C05 Comedian Kathy Griffin shows up on "Glee" (Fox at 8 p.m.), playing a judge at the regionals competition, along with fellow guest-star judge Loretta Devine. Meanwhile, the glee clubs gear up to compete as Sue coaches the rival Aural Intensity, the Warblers create a great set list, and the New Directions underdogs decide to write and perform original songs. Where's Rachael Ray when you need her?! The contestants on "The Biggest Loser" (NBC at 8) have to cook delicious - and healthy - meals in 30 minutes. Plus, they learn they can all win immunity if they conquer their weight loss from last week. Humanity is about to be destroyed on the second-season finale of "V" (ABC at 9), and Erica, Diana and Lisa join to stage a coup and try to overthrow the evil Anna. Their plan doesn't exactly go well, but in other exciting news, actor Marc Singer from the original '80s "V" series guest-stars as a member of a top-secret organization. Joan & Melissa: Joan Knows Best? (WEtv at 9) wraps up for the season as Joan and Melissa try to make up after a big fight. But all may be forgiven when Melissa goes to the doctor with stomach pains, and Joan is thrilled when the doctor recommends a pregnancy test. Burt feels slighted when Jimmy chooses Sabrina as Hope's guardian in his will on "Raising Hope" (Fox at 9), though Sabrina isn't sure she's ready for the massive responsibility. Luckily, Maw Maw is there for comic relief when she is certain that mongooses are running wild in the house. Unhappy that Alexia's Cuban-themed dinner party involves meat, vegetarian Lea causes a fuss about the menu that doesn't suit her dietary needs on "Real Housewives of Miami" (Bravo at 10). "Family Guy" creator Seth MacFarlane serves as roast master on the "Comedy Central Roast of Donald Trump" (Comedy Central at 10:30), and Trump sits back to hear all the jabs from roasters including Larry King, Snoop Dogg, Whitney Cummings, Lisa Lampanelli and, because why not, the Mike "the Situation" Sorrentino from "Jersey Shore." Actor Bradley Cooper stops by "Late Show With David Letterman" (CBS at 11:35) along with actress Mindy Kaling and musical guest Bob Geldof. "The Tonight Show With Jay Leno" (NBC at 11:35) hosts comedian Wanda Sykes, actor Simon Pegg and musician Juanes. Emily Yahr