TONIGHT'S MUST-SEE

"Jekyll" debut, 5 p.m., BBC America (digital cable channel 341). Like many of us, Dr. Tom Jackman has an alternate personality — wilder, more raw. In his case, it often takes control. Jackman sends messages to his alter ego. He hires aides, instructed to restrain him. But the inner demon is growing, even calling himself "Mr. Hyde." The old Jekyll-and-Hyde story is back, in modern dress. This is the superb start to a four-week, six-hour series. It was written by Steven Moffat, the brilliant creator of the British "Coupling." There are brief flashes of humor, but mostly this is a solid, serious drama. James Nexbitt ("Murphy's Law") is perfect in the title role — or roles.

OF LOCAL NOTE

"The 32nd Annual Queen Lili'uokalani Keiki Hula Competition," 6 p.m., KITV. Child dancers from dozens of local halau compete in 'auana (or modern) hula styles at the Blaisdell Arena.

OF NOTE

"Grand Slam," 4 and 7 p.m., GSN (digital cable channel 435). This fun tournament pits 16 of the biggest winners in TV game shows. First, Ken Jennings — who won 74 straight rounds of "Jeopardy" — faces Victor Lee, a "World Series of Pop Culture" champ. Then comes a tight match-up between the all-time champs of "Who Wants To Be a Millionaire" (Kevin Olmstead) and "The Weakest Link" (Michelle Kitt).

"Fallen" part one, 6 p.m.; part two at 8 and 10 p.m., with conclusion Sunday, ABC Family. First is a rerun of last year's film, with a teen (Paul Wesley) learning he has a mystical duty. That part is terrific; the others are merely OK. They lean heavily on coincidence and on action scenes that are hard to follow, with lots of wings ablaze. They also have an unvaried pace; the story is interesting, but the style offers hours of slack-jawed awe.

"Stone Cold" (2005), 6 p.m., Hallmark Channel. Here's a good chance to catch the first of Tom Selleck's portrayals of Jesse Stone, a former Los Angeles cop, now a small-town police chief. It's a good portrait and a solid crime tale.

"The Unit," 7 p.m., CBS. A former member of the team has apparently sold weapons. Now there's an effort to break him out of a Bulgarian jail and then capture the big arms dealer.

"Top Chef," 9 p.m., NBC. NBC inserts a round of this game show from its sister channel, Bravo.

"Saturday Night Live," 10:30 p.m., NBC. Shia LaBeouf hosts, with music from Avril Lavigne.