"Gold Rush" (8 p.m., Discovery, TV-PG) ends its third season with the three teams finding (spoiler alert!) gold.

The end of moose season does not end quite so successfully on "Yukon Men" (9 p.m., Discovery, TV-PG). But the moose might be OK with that.

The antics on "Bering Sea Gold" (10 p.m., Discovery, TV-14) include a joke gone awry and the need for a new dredger.

It's no secret that shows like these are among the most pop-

ular on cable, often outdrawing network series. Their success is due to the distractive quality of extreme workplace shenanigans. But cable networks are also free to air these series repeatedly, allowing viewers to catch them at random and then make a habit of watching them.

Networks are charged with finding the largest audiences, but don't have the flexibility of their rivals. Tonight, A&E offers viewers all of prime time to get hooked on "Duck Dy nasty" (8 p.m. to 11 p.m., TV-PG, r). There's three "Ameri can Pickers" (8 p.m., 9 p.m. and 10 p.m., TV-PG) on His-

tory. MTV unscrambles three

installments of "Ridiculous ness" (8:30 p.m., 9 p.m., TV-PG, and 9:30 p.m., TV-14). That's a lot of the same, again and again.

It's easy to decry the repetitive nature of these schedules, but they represent the way people watch television. In contrast, NBC spends a bundle on a show like "Smash," only to have people dismiss it as a failure after a few outings in its second season.

Perhaps it's time for NBC to take a page from cable. Nobody's watching its current lineup anyway. NBC came in fifth in the February sweeps, losing to CBS, Fox, ABC and Univision. So why not shake things up? As Bob Dylan once warbled, "When you ain't got nothing, you got nothing to lose."

Would anybody really miss "Dateline NBC" or "Rock Center With Brian Wil liams" tonight if the network rolled out three helpings of "Smash" instead? Is it a great show? No. Is it better than "Duck Dynasty"? Give the people a chance to decide.

Back when "Project Runway" first aired on Bravo, its ratings weren't so hot. It only picked up when Bravo aired nothing but "Runway" for a solid weekend. Seriously, NBC, if you showed nothing but "Smash" on Friday, Saturday and Sunday nights, would your ratings really go down?

The CW has become a bit of a niche network. But if it has one minor success story, it's "The Vampire Diaries." A few years back, the CW aired nothing but "Diaries" for a solid week.

Come on NBC, you're No. 5. It's time to try harder. Pick a show, any show: "Smash," "Grimm," "Revolution." Give the people what they want. And if cable has taught us anything, it's that the people want mara-

thons, repeats and a chance to pick up a new habit.

---Oceanographer Bob Ballard explains how his search to find the Titanic became a cover story to throw off the Soviet Union on "Titanic: Ballard's Secret Mission: Revealed" (9 p.m., National Geographic).

---The documentary series "Vanguard" (9 p.m., Current TV) presents "Showdown in Klan Town," about a group of residents in Harrison, a small Arkansas community, who chose to speak up and challenge the town's lingering reputation for bigotry.

OTHER HIGHLIGHTS

---Ramsay encounters an arrogant restaurant owner on "Kitchen Nightmares" (8 p.m., Fox, TV-14).

---Reba's brother (Blake Shelton) wants to market a barbecue sauce with a secret ingredient on "Malibu Country" (8:30 p.m., ABC, TV-PG).

---The numbers point toward a reunion on "Touch" (9 p.m., Fox, TV-14).

---Backstabbing on "Sparta cus" (9 p.m., Starz, TV-MA).

---Gordon sets out to blow

Carrie's cover on "Banshee" (10 p.m., Cinemax, TV-MA).

CULT CHOICE

Charlie Chaplin's 1947 black comedy "Monsieur Verdoux" (8 p.m., TCM), about a serial-killing banker, was unpopular upon its

release, but has gained a cult following since then.

SERIES NOTES

---A sporting chance on

"Undercover Boss" (8 p.m., CBS, r, TV-14).

---A curfew broken on "Last Man Standing" (8 p.m., ABC, TV-PG).

---Ari is located on "Nikita" (8 p.m., CW, TV-14).

---On two episodes of "Blue Bloods" (CBS, r, TV-14): Thanksgiving (9 p.m.), a family friend is slain (10 p.m.).

---A wristband cure for nausea gets the once-over on "Shark Tank" (9 p.m., ABC, r, TV-PG).

---Worries about Elena on "The Vampire Diaries" (9 p.m., CW, r, TV-14).

LATE NIGHT

---John Caparulo, Loni Love and Gary Valentine appear on "Chel sea Lately" (11 p.m., E!, r).

---Jerry Seinfeld, Dave Grohl and the Sound City Players with Stevie Nicks appear on "Late Show With David Letterman" (11:35 p.m., CBS, r).

---Jay Leno welcomes Bill O'Reilly and the Mavericks on "The Tonight Show" (11:35 p.m., NBC).

---"Jimmy Kimmel Live" (11:35 p.m., ABC) glances back at the week.

---Mariah Carey appears on "Late Night With Jimmy Fallon" (12:35 a.m., NBC).

---Craig Ferguson hosts Trace Adkins on "The Late Late Show" (12:35 a.m., CBS).

Kevin McDonough can be reached at kevin.tvguy@gmail.com.