WORTH NOTING ON TV

* SATURDAY

Walker, Texas Ranger (CBS, 10-11 p.m.): The holiday episode of this western offers a story of peace for a tough situation facing US cities - feuding gangs. When Walker (Chuck Norris) learns that his best karate student in an inner-city class has joined a gang, he takes on the war brewing between this gang and another in the neighborhood.

The karate students in this episode are from Kick Drugs Out of America, a nonprofit foundation started by Norris to combat drug abuse and gang-related violence in school.

* SUNDAY

The United Nations at 50: 'A Religious Perspective' (CBS, 11-11:30 a.m.): This interfaith special examines the work of a growing number of religious nongovernmental organizations that advise and aid the UN. People featured include Jane Evans, who was present at the writing of the UN Charter and is now with the Union of American Hebrew Congregations; and William Vendley, international secretary-general of the World Conference of Religion and Peace.

Journey (CBS, 9-11 p.m.): When his mother walks out on the family, Journey (Max Pomeranc) wants to piece everything back together. This Hallmark Hall of Fame presentation gently portrays how Journey works through his unhappiness, finding love and family with his grandparents (Jason Robards and Brenda Fricker) and sister (Eliza Dushku).

Holiday Greetings From the Ed Sullivan Show (FAM, 9-11 p.m.): Hosts Bob Newhart, Kermit the Frog, and Miss Piggy introduce classic holiday film clips from ''The Ed Sullivan Show'' - such as Johnny Mathis singing ''It's the Most Wonderful Time of the Year'' and Bing Crosby performing ''White Christmas.''

* TUESDAY

On the Town (TCM, 7-9 p.m.): Turner Classic Movies pays tribute to Frank Sinatra with a film marathon. Up first is this musical starring Sinatra, Gene Kelly, and Ann Miller, which won an Oscar for Best Scoring of a Musical Picture in 1949.

Please check local listings for these programs.