In the mood for unadulterated video junk food? Shows don’t come much cheesier than “TV Road Trip” (8 p.m., Sunday, Travel Channel) hosted by “Three’s Company” star John Ritter. Welcome to very basic cable. How cheap are the production values? The makers of “Trip” couldn’t even afford the rights to the original TV theme songs, so they play fake, twangy approximations of the familiar scores to “Batman,” Bonanza,” and other favorites. The effect is as oddly comforting as a trip down a supermarket’s generic product aisle. Ritter joyfully delivers cliche-ridden narration and introduces a parade of has-beens who barely qualify for “where-are-they-now” status. This “Road Trip” is so pointless that it’s irresistible.

Although the Travel Channel usually celebrates exotic hideaways or historic sites, “TV Road Trip” returns us to a series of fake places created on Hollywood sets, or real spots that have changed their identities to capture the tourist-attracting magic of contrived TV locales. The hometown of Andy Griffith, Mount Airy, N.C., inspired the Mayberry of “The Andy Griffith Show.” Now the town hosts thousands of tourists looking for the down home hospitality of Andy, Barney and Aunt Bea. Actor George Lindsey, who played “Goober,” gives us a tour of the burg’s diners, barber shops and filling stations, and reminds us why he’s never had much of an acting career since the series’ demise.

This pattern continues throughout the “Road Trip.” Ken Kercheval, whose character, Cliff Barnes, battled J.R. Ewing on “Dallas,” shows up at the real SouthFork ranch, a 340-acre spread just north of the real Big-D. Once a working ranch, it’s now a popular “Dallas”-inspired tourist attraction. Lorne Greene’s widow describes the beauty of the Ponderosa set, lovingly preserved and located in Incline Village, Nev., just outside of Lake Tahoe. “The Dukes of Hazzard” merits two detours. Sperryville, Va., boasts a “Cooter” museum. Ben Jones, (Cooter, himself) also takes us on a pilgrimage to Covington, Ga., where five episodes were filmed.

Ritter provides a drive-by appreciation of dozens of other sites, including the “stately Wayne Manor” of “Batman” fame located in Pasadena, Calif.; the “Melrose Place” apartment building that is actually on Greenwood Place in L.A.; Jim Rockford’s ramshackle home in Malibu; the exterior of the Manhattan apartment building featured on “Friends; and the “Honeymooners” apartment at 328 Chauncey St. in Brooklyn, N.Y. And no armchair TV trip would be complete without dropping by 8970 Cooper Ave. in Queens, N.Y., home to Archie and Edith Bunker.

l Kenneth Branagh stars in the impressive four-hour made-for-television movie “Shackleton” (7 p.m., Sunday, A&E). He’s well cast as the British explorer Ernest Shackleton, who led a 1914 expedition to cross Antarctica only to have his ship get stuck in frozen ice floes. Shackleton’s ability to lead his men safely home over the next two years has inspired many books, documentaries and salutes, but none as lavish as this film.

Tonight’s highlights

 Morgan Freeman, and Ashley Judd star in the 1997 thriller “Kiss The Girls” (7:30 p.m., NBC).

 Mira Sorvino and Lisa Kudrow star in the 1997 comedy “Romy and Michele’s High School Reunion” (8 p.m., ABC).

 WWF vulgarian Mick Foley hosts “Robot Wars: Extreme Warriors” (8 p.m., TNN).

 Tim Allen and Edie Falco engage in absurd patter on Martin Short’s parody talk show “Primetime Glick” (9 p.m., Comedy Central).

 Master P and Insane Clown Posse appear on “Mad TV” (10 p.m., Fox). (Yes, the same Insane Clown Posse who were excoriated by Bill O’Reilly on his Fox special “The Corruption of the American Child.”)

 Cameron Diaz hosts “Saturday Night Live” (10:30 p.m., NBC).