Not all of the following programs will be of interest, or even of value, to everybody, but each is in some way worth considering as a candidate for your viewing schedule for the coming week. In most cases, for space reasons, reruns of worthy programs are not included. FRIDAY Alvin Ailey American Dance Theater (PBS, 9-10 p.m.): Dance in America segment of ``Great Performances'' features the Ailey dancers in their contemporary classic ``Three by Three.'' SATURDAY
World Series (ABC, 8 p.m.; check local listings thereafter). Agatha Christie's `13 at Dinner' (CBS, 9-11 p.m.): Peter Ustinov as Hercule Poirot matches wits with Faye Dunaway. Guess who wins? SUNDAY
And Then the Rains Came (PBS, 8-9 p.m.): Premi`ere of new season for one of public television's top wildlife series focuses on the hardships faced by animals on Kenya's Tsavo plains during drought.
The Last Place on Earth (PBS, 9-10:20 p.m.): ``Masterpiece Theatre'' starts a new season with the tragic inside story of the Scott-Amundsen race for the South Pole. MONDAY
Happily Ever After (PBS, 8-9 p.m.): ``Wonderworks'' comes up with an animated treasure for the whole family -- divorce as seen through the eyes of a little girl. Carol Burnett and Carrie Fischer are among the many stars who provide the voices.
Generations of Violence (PBS, 10-11 p.m.): Intimate examination of the victims and perpetrators of family violence. TUESDAY
The War Between the Classes (CBS, 4-5 p.m.): Schoolbreak Special in which students are required to assume different socioeconomic roles, resulting in strains on romance. Far-fetched, but at least it tries.
What Einstein Never Knew (PBS, 8-9 p.m.): ``Nova'' probes the search by physicists to devise a grand theory of unificaion to explain the enigma of the universe.
The Deadly Game of Nations (PBS, 9-10 p.m.): Fourth episode in ``War: A Commentary by Gwynne Dyer,'' superb antiwar analysis. This segment makes some pointed observations about Israel and the Palestinians. WEDNESDAY
Battle of the Bison Forest (PBS, 8-9 p.m.): ``Survival Anglia'' special about the history of the bison and its forest neighbors.
Penn & Teller Go Public (PBS, 9-9:30 p.m.): The bad boys of magic make you laugh at the inexplicable. THURSDAY
Presidents and Politics with Richard Strout (PBS, 8-9 p.m.): The Monitor's own Richard Strout takes ``A Walk Through the Twentieth Century with Bill Moyers,'' in a repeat of this already-classic series.
Death of an Expert Witness (PBS, 9-10 p.m.): The first detective novel by P. D. James to be dramatized for TV offers viewers a chance to solve the mystery at the same time as Chief Superintendent Adam Dalgliesh of Scotland Yard.
Please check local listings since, especially in the case of PBS, local option sometimes results in different dates and times.