You may want to set your VCRs...

You may want to set your VCRs for the sci-fi fantasy Land of the Giants (every Sunday at 6 a.m. on USA). This week, the tiny travelers battle a giant boy’s radio-controlled toy army.

Nick at Nite’s marathon of the entire 158 episodes of “The Dick Van Dyke Show” continues every day this week, 8 p.m.-6 a.m.

A loss of a tooth and an eclipse of the sun causes Timmy (Jon Provost) to have a nightmare about Lassie on “Jeff’s Collie” (Monday at 2:30 p.m. on Nickelodeon).

Reruns of “thirtysomething,” the highly acclaimed, Emmy-winning yuppie angst series which aired on ABC for four seasons, begin on Lifetime Tuesday (8 p.m.-midnight) with a four-hour marathon of select episodes. The very first episode of the show airs Wednesday at 11 p.m. “thirtysomething” will air regularly Mondays-Fridays at 2 and 11 p.m. and Saturdays at 3 p.m. Mel Harris, Ken Olin, Polly Draper, Melanie Mayron, Timothy Busfield, Patricia Wettig and Peter Horton star.

Cousin Itt (Felix Silla) lets his hair down when he comes for a visit on “The Addams Family” (Thursday at 4:05 p.m. on TBS).

The legendary Hollywood gossip columnist Hedda Hopper drops in on the Clampetts on “The Beverly Hillbillies” (Friday at 3:05 p.m. on TBS).

Dying to know how accident-prone Capt. Parmenter (Ken Berry) came to lead the men of Fort Courage? Then check out “F Troop Super Saturday” (Saturday from 10 a.m. to noon on Nickelodeon), featuring the first four, black-and-white episodes of the slap-happy ‘60s comedy series.