Jack Webb and Harry Morgan re-surface in their classic roles as Joe Friday and Bill Gannon in "Dragnet," which becomes a nightly feature on Nick at Nite beginning with an eight-episode marathon Friday from 8 p.m. until midnight. Nickelodeon is calling it -- are you ready? -- "Friday's Friday."

Criminals try to run from this duo of hard-working Los Angeles policemen, but it's no use: The cops always win. The classic police drama will be a seven-nights- a-week fixture at 9:30 p.m. beginning Saturday.

Monday on The Discovery Channel the world television premiere of "Discovery Sport" at 2 a.m. (Tuesday). Each episode of the 13-part series profiles an outstanding player, coach or team from the wide variety of sports covered. The first show includes American high school football, Australian rules football and Holland's International Tug-of-War Championships. Each week the show will repeat on Wednesday at 8:30 p.m. and Saturday at 5 p.m.

Tuesday on VH-1 from 11 a.m. until 8 p.m. the countdown of 1990's top 90 music videos with guest hosts Wilson Phillips, Anita Baker and David Cassidy. Videos include Janet Jackson's "Come Back to Me," Madonna's "Vogue," Billy Joel's "I Go to Extremes," Wilson Phillips' "Hold On," Michael Bolton's "How Am I Supposed to Live Without You?," Suzanne Vega's "Book of Dreams," Bonnie Raitt's "Nick of Time" and Lyle Lovett's "Here I Am."

Tuesday on The Nashville Network at 9 p.m. "This Country's Rockin' " shows off the bond between rock 'n' roll and country music as Carl Perkins joins Foster and Lloyd in a high energy concert taped at the Silverdome in Pontiac, Mich. The one-hour show repeats at midnight.

Wednesday on The Discovery Channel at midnight the cable debut of "War Chronicles." This 13-part series begins with the Battle of the Bulge and documents all the historic turns of World War II in Europe. Hosted by Patrick O'Neal, each episode repeats on Fridays at 9 p.m. and Sundays at 4 p.m.

Saturday on HBO at 10 p.m. the premiere of "HBO Comedy Hour: Roseanne Barr Live From Trump Castle." The all-new uncensored, no-holds-barred, one-hour, stand-up special includes a medley of songs for women and another for men, caustic observations on what men really want, parting words for talk show host Arsenio Hall, and a reprise of Barr jokes from bygone years. Following the special, Barr and her husband, Tom Arnold, will take calls in an unprecedented 30-minute phone-in show beginning at 11 p.m. Additional playdates: Jan. 9, 14, 17 and 20.