Halloween isn't until next week, but the networks have already carved out programming designed to tingle the spine well before the big night. So light the jack-o'-lantern, dim the lights and prepare for a scare from this early Halloween fare.
* MonsterFest 2005, AMC. More than 200 hours of horror flicks start Sunday and run through Halloween night. A new "Movies That Shook the World" episode featuring "The Exorcist" airs Friday at 10 p.m.
* Great Mysteries Week, History Channel. Starting at 8 p.m. each night this week beginning Monday, History delves into some of our culture's most mystifying secrets. The week culminates Saturday night with a showing of "The Haunted History of Halloween" and a "History's Mysteries" episode on legendary monsters.
* Arthur, PBS. Halloween-themed episodes of the child-friendly animated series air each weekday at 7 a.m. and 5:30 p.m. on WETA and at 5 p.m. on MPT.
* the Great Pumpkin, Charlie Brown, 8 p.m., ABC. Linus awaits the arrival of the benevolent jack-o'-lantern in this Peanuts Halloween tradition.
* Scooby-Doo marathon, Boomerang. Zoinks! Nonstop Scooby programming starts at midnight and runs through Oct. 31. (Boomerang's sister channel, Cartoon Network, runs prime-time Scooby all week.)
* Masters of Horror, 10 p.m., Showtime. Prominent horror directors come together to produce a series of original one-hour horror films. The series premieres tonight with two short films; two more air Saturday night.
* Secret Life of Vampires, 8 p.m., A&E. This new program takes viewers to Dracula's birthplace and shows modern vampires practicing their craft. (Yes, there's bloodletting -- and blood-drinking -- involved.)
* Weekend, Nickelodeon. Programming for teens, tweens and tots is sprinkled throughout the weekend starting tonight. Check listings for specific programming.
* Ed, Edd n Eddy's Boo Haw Haw, 7 p.m., Cartoon Network. In this new episode, the three sugar-seeking pals scope out a neighborhood known for its liberal candy-giving.
* Haunting, 8 p.m. on Discovery. This series, premiering tonight, chronicles the terrifying true stories of the paranormal told by folks who experienced real-life horror.
* Scary Movie, 8 p.m., NBC. Teenagers are stalked by a bumbling serial killer in this parody of the horror genre.
* The Shining, 8 p.m., A&E. The Stanley Kubrick classic stars Jack Nicholson as a deranged man determined to kill his wife and young son.
* 100 Scariest Movie Moments, 7 p.m. Bravo counts down the most bone-chilling moments in cinematic history.
* Scare-a-thon, FX. A full day of horror programming begins at noon and features "The Blair Witch Project" at 8 p.m.
* Scary movie marathon, ABC Family. The network's 10-hour scare-a-thon begins at 2 p.m. and features "The Sixth Sense" at 8 p.m.
-- Brad Walters