The Dracula/Van Helsing battle begins on the newest episode of NBC's "Dracula." (Jonathon Hession /NBC)

Books, movies and TV shows have all been influenced by the blood-sucking undead, but why? “Why We Love Vampires” (NBC at 8 p.m.) explores the recent fandom from “The Lost Boys” to “Twilight” and on to the new NBC show that airs just one hour after this special.

Newly introduced Samantha is already passing down sex advice to a younger generation on “The Carrie Diaries” (CW at 8). Meanwhile, Carrie and Walt have problems with their new roommate, and Walt tries to declare his true feelings for Bennet.

The first part of the “MasterChef Junior” (Fox at 8) finale opens with the top four chefs creating chicken dishes. After this week’s elimination, there will be two chefs left to go head to head in the finale.

The designers are asked to make a futuristic look for pop star Kylie Minogue to wear at the launch of her fashion book on “Styled to Rock” (Bravo at 8). Famed designer and new Moschino creative director Jeremy Scott is guest judge.

“Time of Death” (Showtime at 9) is an unflinching, in-depth look at some remarkable individuals facing their own imminent mortality. The docu-series follows brave, terminally ill people as they live out their final days, supported by family, friends, health-care teams and hospice workers who gently help guide the process.

The community is still reeling from last week’s zombie attack on “Grimm” (NBC at 9). Nick is ailing, and Capt. Renard works to remedy the fallout. Adalind spends more time with Stefania in hopes of regaining her powers.

RETURNING SHOW: The season five opener of “The Dead Files” (Travel at 10) has Steve and Amy helping a military family in Cressona, Pa., that says it’s experienced paranormal encounters. They find out about a local plague and a train that exploded not far from home.

NBC proves America’s vampire obsession with the continuation of “Dracula” (10). Grayson and Lady Jayne become lovers, and Mina accepts his help with a challenge. Villain Van Helsing continues to work on a solar vaccine to debilitate Dracula.

Actor Morgan Freeman and standup comedian Brian Regan come to the “Late Show With David Letterman” (CBS at 11:35).

Actress Melissa McCarthy and TV host Andy Cohen join “The Tonight Show With Jay Leno” (NBC at 11:35), with musical guest Empire of the Sun.

The cast of “Modern Family” is on “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance by Ben Rector.

— Rachel Lubitz