Nothing says stay-at-home holidays like Syfy marathons of Rod Serling’s classic anthology series. Impatient viewers can tune in at 8:30 a.m. ET for a half hour, then return at 7:30 p.m. ET, to catch two of William Shatner’s Twilight Zone classics: first, as the superstitious fortune reader in “Nick of Time” (pictured), then as the frightened airplane passenger in “Nightmare at 20,000 Feet.” But for the TV faithful who are really in the Zone, the treats are served up all day long. Including at 6:30 p.m. ET, when “To Serve Man” cooks up one of the series’ most famous climactic plot twists.