Not all 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 week ahead. FRIDAY Dr. Fischer of Geneva (PBS, 9-10:40 p.m.): Season premi`ere of ``Great Performances'' is a bizarre tale of love and humiliation, adapted from a Graham Greene novel and featuring James Mason in his last role.
Twilight Zone (CBS, 8-9 p.m.): Three-part fantasy anthology series is turning out to be the best of the new TV anthology shows. SATURDAY
Out of the Darkness (CBS, 9-11 p.m.): Martin Sheen gives fine performance as Ed Zigo, the detective who solved the famous Son of Sam murder case in New York. Much more than just another crime drama, this is a sensitive attempt to humanize police work. Previewed today. SUNDAY
Doris Day's Best Friends (CBN cable, 7-7:30 p.m.): Little animals and big stars are featured on this new interview show with Miss Day.
Toughlove (ABC, 9-11 p.m.): Lee Remick and Bruce Dern star in a drama about how a solid Yuppie family copes with an uncontrollable teen-ager. Help comes from the controversial organization called Toughlove, which insists upon unforgiving discipline. Previewed yesterday in these pages. MONDAY
Wonderworks (PBS, 8-9): Part 2 of ``Konrad,'' about a factory-made child. For the whole family, especially the youngsters.
Silent Witness (NBC, 9-11 p.m.): Docu-drama on gang rape and its aftermath, handled with sensitivity, but still stark and for adults only.
War in the West: The Management of Federal Lands (PBS, 10-11 p.m.): A look at how the federal government is managing our national parks, forests, and other federal properties.
The Enlightened Machine (PBS, 9-10 p.m.): Repeat of one of PBS's most widely praised series, ``The Brain,'' starting with the premi`ere episode summarizing the history of science's efforts to unlock the secrets of the human brain.
Country Music Association Awards (CBS, 9:30-11 p.m.): The 19th annual Grand Ole Opry hootenanny, live from Nashville with awards to top country songs and performers. TUESDAY
Promises to Keep (9-11 p.m.): Robert Mitchum, his son Christopher, and his grandson Bentley C. star in a drama about, you guessed it, three generations of a family.
War: A Commentary by Gwynne Dyer (PBS, 9-10 p.m.): Another in fine antiwar series, it manages somehow to be done with both charm and biting sarcasm.
Seeds of Tomorrow (PBS, 9-10 p.m.): ``Nova'' examines the need to preserve seed varieties to maintain genetic diversity in tomorrow's crops.
Dateline: USSR/USA (PBS, 10-11 p.m.): Through a satellite linkup earlier in the day, Soviet correspondents in Washington discuss recent world events and their coverage by the media with American correspondents in Moscow. WEDNESDAY
Aaron Copland: A Self-portrait (PBS, 8-9 p.m.): Archival footage and Copland reminiscences about his six-decade career in music.
The Skin Horse (PBS, 9-10 p.m.): A disturbingly frank and graphic British film about the sexual and emotional needs of the disabled, followed by a round-table discussion of the film and its content. Unsettling, unnerving, but, arguably, necessary.
Space Senator: One-Way Jake (PBS, 10-11 p.m.): A documentary about the space frontier through the eyes of US Sen. Jake Garn as he fulfills his dream of becoming a space traveler. Please check local listings since, especially in the case of PBS, local option sometimes results in different dates and times.