Fans of TV's nail-bitingest action drama "24" will have no problem recalling one or more scenes from last season that had them saying to the TV set, "Oh, c'mon!" Faced with the challenge of creating a single story spanning 24 hours while ensuring viewers rarely lost sight of special agent Jack Bauer (Kiefer Sutherland), the show's writers used every trick in the book. Thus Jack's daughter, Kimberly (Elisha Cuthbert), spent hours extracting herself from the pit, only to find herself dragged right back into it. Toward the end, an endless cat-and-mouse with Dennis Hopper had no right to go on for four hours but did anyway. Yet it worked marvelously well. As I sat watching the compelling if not entirely satisfying first hour of the new season of "24" (8 tonight on Fox), I found myself wondering why. A big reason, I'm convinced, are these simon-pure characters at the center - Jack, Kim, Palmer (Dennis Haysbert) - with their unblemished devotion to each other and their families. Without revealing anything from tonight's episode, I can report that Jack's preoccupation with his loved ones is carried to new extremes. The genius of "24," it would seem, is that it has taken two seemingly incompatible and overdone TV genres, the family drama and the action thriller, and crashed them together. The result is something new and surprising almost despite itself. Another reason the show works, believe it or not, is the commercials. The whole idea that "24" operates "in real time," with exactly one hour elapsing in the course of an episode, was never very sound to begin with. Most viewers were willing to forgive the artifice, possibly because most of them do not live in Southern California where a five-minute drive wouldn't even get you out of the drive-thru at In-N-Out Burger, let alone effortlessly cover some of the distances proposed by the show. The commercials, at least, helped us suspend our disbelief. They gave us a breather from the relentless pace of "24's" world. Tonight's episode, however, is commercial-free. That's a considerate gesture toward viewers and a promotable gimmick but perhaps not in "24's" best interest. I found myself paying more attention to how much distance people covered when the camera wasn't on them. One other comment, which is not meant to diminish anyone's enjoyment but must be pointed out. The Fox network's fascination with youth does this show a disservice. When the department heads are gathered for a meeting at the top-secret Counter Terrorism Unit, it looks less like a brain trust of America's intelligence wonks than it does a staff meeting at your local Gap. Geography has nothing to do with this bias. I'll bet if Fox Entertainment chief Gail Berman called a meeting of her department heads, she'd have a better composite of America than what we see on "24." "TV Land Legends: The 60 Minutes Interviews," 8 p.m. Sunday, TV Land. There is a lot of high-quality television from my boyhood that I'd like to see on TV again. Trio, a channel you may never have heard of, just picked up 80 episodes of the old NBC "Late Night With David Letterman" and will start to air them over Thanksgiving weekend. One cheer for that. TV Land is mining the archives of "60 Minutes," which has certainly had its share of celebrity interviews over the years. The first four profiles - Jackie Gleason, Johnny Carson, Jerry Seinfeld and Carol Burnett - air back-to-back this weekend. Another cheer. Gleason, chain-smoking his way through a sentimental 1984 interview with Morley Safer, could easily have filled a "60 Minutes" broadcast by himself. Others are more circumspect. Seinfeld spends a few minutes intelligently explaining his approach to TV comedy to Steve Kroft. And that's all, folks. The rest of the half-hour is padded with useless, "Biography"-like updates on Seinfeld's life and small talk between his "Seinfeld" co-stars and Kroft (who unfortunately comments, "Jason Alexander, Julia Louis-Dreyfus and Michael Richards are all good enough to have their own series"). Carson's segment (from 1979) has to be padded, too, but the results are more rewarding: A card trick Johnny played on Mike Wallace is seen here for the first time. Ed Bradley is host of "TV Land Legends." "National Geographic Today," 6 and 9 p.m. weekdays, National Geographic Channel. I'm sorry to report that "Nat Geo Today," the terrific daily digest of planet Earth, is cutting back. It still will air weekdays, but beginning Monday as a half-hour program. On the plus side, that means more people can see the worthy documentary series "Surviving West Point." Formerly stuck on Saturday nights, it airs in the newly opened half-hour at 6:30 p.m. and 9:30 p.m., Mondays after "Nat Geo Today." "Scrubs," 7:30 p.m. Thursday, NBC 41. In the name of cross-promotion, "Ed's" Tom Cavanagh shows up as the older brother of J.D. (Zach Braff). Little attempt is made to alter Cavanagh's character from the cocksure, fast-talking bowling lawyer he plays on the same network on Wednesday nights. I liked it, but then, I like both shows. Nielsen soon will tell us whether there are millions like me - or if this is the first and last appearance of J.D.'s big bro. My lament last week that I couldn't get my new On Demand pay-per-view system to work brought a flurry of interest from Time Warner personnel. And I got a voice mail from the person I was really looking for: some other reader who shared my pain. "The way to get it to work is to keep rebooting the cable box," said Jose Lopez of Kansas City. Sure enough, the sixth time was the charm. (If On Demand keeps telling you your movie cannot be accessed, hold down the power button of your digital box until the display says "boot." Then try again. And again.) You can reach Aaron Barnhart through the TV Barn Web site at www.tvbarn.com @ART CAPTION:Kiefer Sutherland returns for a second season of "24" at 8 tonight on Fox. @ART:Photo (color) @ART CREDIT:Fox

