On The Weekend Watch:
THE PROMOTION APPARATUS -- It's subtle, but don't you think this is still a publicity tie-in to CBS' coverage of this year's Olympic Games? Gold medal gymnast Mary Lou Retton gets a guest shot on tonight's edition of "Knots Landing" (at 10, Channel 11). She plays herself in a story line in which Greg (William Devane) arranges an instruction session for daughter Meg (Rhianna Janette).
WHEN THE SHARK BITES -- The Maryland-based Discovery Channel cable service has quite a thing for the ocean's teeth-gnashing predators, and is wading into the surf again for "Shark Bowl, '92," a four-day feature of documentaries about sharks. Surfacing first is "The World of Sharks and Barracuda" at 8 p.m. Friday, with additional shows through the weekend including "Shark Shooters," "Sharks -- Hunters of the Seas" and "The Great Whites of Dangerous Reef."
A NEW MYSTERY -- A new three-part sequence of the PBS "Mystery!" series gets under way tonight. In the two-hour opener, "Prime Suspect" (9 o'clock on Maryland Public Television), Helen Mirren stars as Scotland Yard detective Jane Tennison, who has risen to chief inspector in spite of sexual harassment. Lingering gender resentment, however, may thwart a murder investigation.
A NEW ROLE -- Remember Khrystyne Haje of the ABC series "Head of the Class?" The actress is a guest star Saturday in the network's "The Young Riders" (9 p.m., Channel 13). She plays a mysterious young woman who involves The Kid (Ty Miller) in a plot to locate a list of gold shipments and get the information to the Southern forces.
THE MOVIE MARQUEE -- One of the great movies of the Japanese schlock-horror school is getting a cable play on Saturday. It's the 1962 "Mothra" (9 p.m., TNT) in which diminutive twin girls are taken from their ocean island by exploitative explorers who come to regret it. The title character is first seen as a caterpillar, then a chrysalis and finally, a soaring, mean mama of a moth.
THE SPORTS SCENE -- It's Super Bowl weekend, of course, and Channel 11 is devoting two hours of prime time on Friday to previewing contest XXVI between the Washington Redskins and Buffalo Bills. "Road to the Super Bowl" and "Super Bowl Special XXVI" run back-to back at 8 p.m. CBS coverage of the game itself on Sunday begins with pre-game activity at 3:30 p.m., and kickoff at 6 p.m. But also worth noting Sunday is the final installment of CBS Sports' warm-up for its coverage of the 1992 Olympic Winter Games (Feb. 8-23). "Olympic Winterfest: Countdown to Albertville," at 2 p.m. is live from Moutiers, France, with co-hosts Tim McCarver and Paula Zahn. Events to be covered include men's speed skating from Davos, Switzerland, and previews of the Olympic figure skating competition and the men's downhill skiing race.