All over the TV cable and satellite spectrum today, you can see marathons of spooky movie franchises: the Halloween movies on AMC (beginning at 10 a.m. ET), most of the Nightmare on Elm Street movies on Syfy (beginning at 9n a.m. ET), even the Saw movies on IFC (beginning at 3:45 p.m. ET). But for Halloween purists, one better place, especially if there are younger eyes still watching, is TCM’s lineup of classic horror films starring Vincent Price. The action starts at 8 p.m. ET with 1961’s The Pit and the Pendulum, a start that’s entire apro-Poe – and  continues all night and even into Friday morning, when TCM concludes with two of the best: 1968’s creepy witch-hunting drama The Conquerer Worm (at 6:30 a.m. Friday) and the wittiest serial-killer movie ever made, 1973’s Theatre of Blood (8:15 a.m. ET Friday), co-starring Diana Rigg and using the works of Shakespeare as inspiration for vengeful, imaginative bloodshed.