Syfy’s in-sequence, every-episode mega-marathon of The Twilight Zone is still going strong – and takes longer, now that we’re into the one-hour episodes from Season 4. Season 5, returning to the 30-minute format, begins at 7 p.m. ET, and that’s when you’ll get more of the timeless classics – including, at 7 p.m. ET, William Shatner in 1963’s “Nightmare at 20,000 Feet,” and, at 8:30 p.m. ET, Telly Savalas being terrorized by a doll in “Living Doll” (pictured).