Worth Noting on TV

SATURDAY

Mystery Science Theater 3000 (Comedy Central, 5-7 p.m.): For seven years, TV audiences have enjoyed the wisecracks a human and some robots have made about cheesy movies. The fun comes to an end, though, with the show's last installment, the 1978 sci-fi movie "Laserblast." But "MST3K" fans can take heart; the show's creator, Joel Hodgson, premires a comedy/variety show immediately afterward: The TV Wheel (Comedy Central, 7-8 p.m.).

About Books (C-SPAN2, 9 p.m.-12 midnight): "Booknotes," C-SPAN's author-conversation program, now has a sister series on C-SPAN2 focusing on books about politics, policy, and history. The twice-weekly series continues its debut Sunday, 9-11 p.m.

SUNDAY

Murder, She Wrote (CBS, 8-9 p.m.): Angela Lansbury undertakes her last murder-mystery case in the 264th and final episode of this 12-year-old show. The lighthearted drama finds the amateur detective at a troubled classical-music station in San Francisco.

MONDAY

The Fresh Prince of Bel-Air

(NBC, 8-9 p.m.): Also weighing in with its series finale is this comedy starring rapper Will Smith. When the Banks family puts their mansion up for sale, potential buyers include guest stars from "The Jeffersons" and "Diff'rent Strokes."

Nightline (ABC, 11:35 p.m.-12:05 a.m.): Tonight, "Nightline" launches what it plans to be a regular feature: "America in Black and White." Racial topics, from the perspectives of both whites and blacks, will be covered through documentary reports by Ted Koppel, town meetings, and field interviews. Special segments of the new feature will air through Friday.

TUESDAY

Frontline (PBS, 9-10 p.m.): During the height of the Midwest's presidential primaries, this documentary series visited Wisconsin to see how companies, workers, and civic leaders are dealing with global competition. The program poses the question, "What do corporations owe their employees and their communities?"

*Please check local listings for these programs.