"Is It Real?: Vampires" (8 p.m., National Geographic Channel): Here's a bloody good question: Are vampires real? Just in time for Halloween, National Geographic Channel sinks its teeth into this exploration, applying modern-day forensic science to probe the myths, sightings and viability of the centuries-old vampire legend. The program journeys to a remote village in Romania -- near the legendary home of Count Dracula -- where six men were arrested for cutting out a corpse's heart and burning it after they saw a bloodstain around the corpse's mouth. In Las Vegas, a self-proclaimed modern-day vampire calmly draws his girlfriend's blood and drinks it from a glass. He claims to have had such a craving since childhood. Is there a scientific explanation for the vampire legends? When faced with illness or epidemic, did past generations blame the dead and exorcise them as vampires to save the living? Or do vampires actually exist among today?
"Why I Wore Lipstick to My Mastectomy" (9 p.m., Lifetime): Sarah Chalke, one of the funny gals from "Scrubs," stars in "Why I Wore Lipstick to My Mastectomy," a made-for-cable film based on the sassy and irreverent memoir by breast cancer survivor Geralyn Lucas, who was diagnosed at age 27. Jay Harrington co-stars, and singer Patti LaBelle makes a cameo appearance.
"Weeds" (10 p.m., Showtime): The season finale has arrived! Will Nancy puff, puff, give in to her DEA agent/ pseudo-husband?