Some people have safety concerns. Others can't go out because they're on Y2K alert. And still others have better uses for 100 bucks than spending it on some millennium-themed New Year's Eve bash (especially those party poopers who insist this isn't even the "real" millennium). Whatever the reason, the networks are betting that a lot of you are planning to spend Friday night, and well into Saturday, parked in front of your TV sets, watching the arrival of the year 2000 from a safe distance. And since for every action there's a reaction, several cable networks are countering with marathons intended to get the attention of channel surfers bored with millennial hype. At or just before 4 a.m. on Friday, several networks plan to be live with coverage of the first New Year's celebrations taking place along the International Date Line and moving from one time zone to the next for the rest of the day. ABC, PBS, Pax, CNN and Fox News Channel all plan to sign on then and not switch away until well after midnight. Most of the planned TVcoverage will have a patina of seriousness atop a good deal of celebrity-hawking and infotainment: "PBS Millennium 2000" kicks off its 25-hour run at around 3:45 a.m. The entertainment here, not surprisingly, runs a diverse gamut, from a ballet performance atop (yes, atop) the Sydney Opera House to the Gipsy Kings serenading Miami to - and I'm quoting the PBS guide - "love songs from the symbol of love, the Taj Mahal in India." Hey, if PBS doesn't play Taj Mahal love songs, who will? The serious-minded Gwen Ifill anchors the PBS day side while fun-loving Will Durst handles the night side. ABC's coverage of Y2K is falling squarely on the shoulders of Peter Jennings, who anchors the network's 24-hour telecast from New York's Times Square starting at 4 a.m. on Channel 9. Signed up to perform are Billy Joel (live from Madison Square Garden), Aretha Franklin, Enrique Iglesias, Sting, Andrea Boccelli and many others. Of course Dick Clark will materialize on ABC sometime around midnight to do his annual homage in Times Square. For sheer tonnage, CNN has everyone whipped in the Y2K department: 100 hours of wall-to-wall coverage, starting at 4 a.m. Friday and petering out sometime Tuesday morning. CNN has produced dozens of thematic segments, some looking back, some looking forward. Topics include human rights, the environment, genealogy, population trends, travel, gay culture, medicine, stress, racism and, of course, the Internet. Among the 60 CNN correspondents stationed around the world will be Christiane Amanpour (Greenwich, England), Wolf Blitzer (the Washington Mall), Charlayne Hunter-Gault (Johannesburg) and Jim Moret (the pyramids of Egypt). ABC and NBC also plan news coverage from many of the same global spots as CNN, and likewise MSNBC and Fox News Channel both plan continuous, round-the-world coverage of the various New Year's celebrations. "Millennium Live," a star-studded global event from the folks who brought you Live Aid, airs on the Pax network (seen locally on KPXE, Channel 50) starting at 5 a.m. Friday. The telecast, which is being seen in 156 countries and heard in 12 languages, features musical performances from the Bee Gees, Blondie, Chicago, the Pretenders, Roger Daltrey, 10,000 Maniacs and even a few artists who have had a hit in the '90s. Other all-day marathons on Friday include a pile-on of disaster movies on Encore (starting with "Airport 1975" at 11:10 a.m.); a countdown of BET's top 100 videos starting at 10 a.m. (we're told that No. 1 is not "Thriller"); a repeat of the uninspiring 15-hour retrospective "The Century" on The History Channel at 6:30 a.m.; nonstop episodes of "Millennium" (natch) on FX starting at 11 a.m.; and perhaps more dazzling than anything else on, a night of Cirque du Soleil, starting with the amazing "Quidam," at 7 p.m. on Bravo. Witching hour As midnight in the United States approaches, the clear choice for viewers watching TV from beneath their beds will be Fox News Channel. Sean Hannity and Alan Colmes will debate "Year 2000: Calm or Chaos?" at 8 p.m., followed by special reports from "America's Most Wanted" host John Walsh from a crisis center in New York. Presumably if Y2K chaos can be detected anywhere, it's from a crisis center in New York. For good paranoid measure, Fox News will also toss to the UFO mecca of Roswell, N.M., when midnight strikes there (2 a.m. Kansas City time). Other New Year's Eve highlights: CBS, the only network taking a purely entertainment approach to New Year's Eve (CBS News and Time magazine did collaborate on some earlier specials), raises a Tiffany glass to "America's Millennium" beginning 9 p.m. on Channel 5 (with a break from 10 to 10:30 for local news). President Clinton, Will Smith, Jack Nicholson, Muhammad Ali and Celine Dion are among those appearing on the program, which also will air the premiere of an 18-minute short film from Steven Spielberg, "The Unfinished Journey." Just to keep things in perspective, though, David Letterman will stick his head in a bowl of eggnog during an early-evening "Late Show" at 7 p.m., also on Channel 5. NBC's Tom Brokaw and Katie Couric anchor a two-hour special from Times Square from 8 to 10 p.m. on Channel 41. Following local news and a 15-minute "Tonight Show With Jay Leno," they return at 10:50 p.m. to count down to the Times Square ball drop. Fox's Brit Hume and Paula Zahn also will be in Times Square starting at 11 p.m. on Channel 4. (Perhaps they can wave at Peter, Tom and Katie.) Though Fox is saying its coverage will be different from Fox News Channel's, the two networks both plan to visit Roswell and that New York crisis center. Should you tire of listening to adults pontificate on the meaning of Y2K, Nickelodeon has an alternative: 24 hours of kids pontificating on the future. "Nickellennium," which begins at 11:01 p.m. Friday, will air commercial-free with the opinions of children from more than 100 countries. Finally, beginning Sunday morning CNBC will air the opening bells from more than 175 stock exchanges and financial markets around the world. And as Planet Y2K returns to business as usual, consider it your cue to resume normal viewing. Or at least come out from under the bed. - To reach Aaron Barnhart, phone (816) 234-4790 or visit the TV Barn Web site at www.tvbarn.com @ART CAPTION:Dick Clark will be at Times Square for New Year's Eve as usual, but this time his show is just a small part of ABC's massive coverage of the turn of the century. @ART:Photo (color) @ART CREDIT:ABC