BY CLIF GARBODEN

THURSDAY 21

9:00 (2) National Geographic’s Strange Days on Planet Earth: Predators/Troubled Waters. Scare away the predators and what do you get? According to this, the results could be "bands of voracious howler monkeys, a glut of iguanas, and hordes of ravenous ants." And thanks to toxins in the world’s waters, we’re losing frogs and whales and getting too many "monstrous sea stars" in Australia. To be repeated on Friday at 10 p.m. on Channel 44. (Until 11 p.m.)

FRIDAY 22

8:00 (44) National Geographic’s Strange Days on Planet Earth: Invaders/The One Degree Factor. Repeated from last week. Tonight’s dangers are displaced plants and animals that jump continents and destroy their new environments and climate changes caused by energy use that lead to selective extinctions. (Until 10 p.m.)

10:00 (2) Farming the Seas. Having done our best to ruin our planet’s soil, we now go after its water. "This documentary "travels from British Columbia and Mexico to Thailand and the Mediterranean coast to explore what’s at stake as the aquaculture industry spreads across the globe." Could what’s at stake be Earth’s survival? (Until 11:30 p.m.)

SATURDAY 23

1:00 (44) The Grand Ole Opry’s Vintage Classics. Didn’t we have pledge programming just a month or so ago? This certainly looks like a resumption. Classic clips from Eddy Arnold, Willie Nelson, Dolly Parton, Patsy Cline, Johnny Cash, Loretta Lynn, and Chet Atkins. Vince Gill hosts. To be repeated on Sunday at 8 p.m. (Until 2:30 p.m.)

2:30 (44) California Dreamin’: The Songs of the Mamas and the Papas. Suspicions conÞrmed. Classic performances, clips, and interviews featuring John Phillips, Michelle Phillips, Denny Doherty, and Cass Elliot. To be repeated on Tuesday at 9 p.m. on Channel 2, and on Thursday at 4:30 p.m. on Channel 44. (Until 4 p.m.)

3:00 (6) Basketball. NBA Þrst-round playoff action.

4:00 (44) Dr. Christiane Northrup’s Mother/Daughter Wisdom. For those who somehow missed the umpteen airings of this in February and March. Suze Orman: For the Young, Fabulous, and Broke, Ageless Skin: Secrets from Dr. Denese, and Dr. Wayne Dyer: The Power of Intention are also back. To be repeated on Monday at 4 p.m., and on Thursday at 12:30 a.m. on Channel 2. (Until 6 p.m.)

6:00 (44) My Music: The ’60s Experience. Repeated from last month. The roster of performers includes Roger McGuinn (the Byrds), Eric Burdon (the Animals), Chuck Negron (Three Dog Night), and John Kay (Steppenwolf). To be repeated on Sunday at 2 a.m. on Channel 2, and on Monday at 8 p.m. on Channel 44, and on Tuesday at 3:30 p.m. on Channel 44 and 1 a.m. on Channel 2. (Until 8:30 p.m.)

6:20 (2) The 10 Tenors: Larger Than Life. Who knew? They’re Australian, and in this 2004 concert from Brisbane, they "blend music and comedy." (Until 8 p.m.)

8:00 (2) Funny Blokes/Ladies of British Comedy. Okay, we’re stumped. The WGBH Members’ Guide has "Funny Blokes"; the Web site has "Funny Ladies." On the one hand, Rowan Atkinson of Blackadder, John Cleese of Fawlty Towers, and Geoffrey Palmer of As Time Goes By, with bloke Lenny Henry (Chef) hosting. On the other, Mollie Sugden of Are You Being Served?, Judi Dench of As Time Goes By, Prunella Scales of Fawlty Towers, and Patricia Routledge of Keeping Up Appearances, with genuinely funny lady Penelope Keith (Good Neighbors, To the Manor Born, Born and Bred) hosting. Hard to lose either way, but why can’t ’GBH clean up its act? (Until 10 p.m.)

8:00 (6) Wonderful World of Disney: Laura Ingalls Wilder’s Little House on the Prairie. The fourth installment of the six-hour Disney production following the Ingalls family’s adventures as chronicled in the third book of the popular all-American pioneer series, which brings the family to Kansasis (Until 9 p.m.)

8:30 (44) Celtic Woman. Actually, there are Þve Celtic women here: singers Chlo‘ Agnew, Lisa Kelly, MŽav N’ Mhaolchatha (Þrst name should be MŽadhbh, but then the whole thing would be really daunting), and Orlagh Fallon plus violinist M‡irŽad Nesbitt, who "engages in a musical battle with two Irish bodhr‡n drummers." Ms. N’ Mhaolchatha, meanwhile, sings "a unique arrangement of ‘Danny Boy’ and ‘She Mov’d Through the Fair.’ " From a 2004 concert at Dublin’s Helix Centre. To be repeated on Sunday at 2:15 p.m. on Channel 2, and on Monday at 10:15 p.m. on Channel 2, and on Wednesday at 9 p.m. on Channel 44. (Until 10:45 p.m.)

9:00 (6) Jurassic Park III (movie). The only-okay 2001 Jurassic entry has Paul (William H. Macy) and Amanda Kirby (TŽa Leoni) getting pal¾ontologist Alan Grant (Sam Neill) to help them save their 14-year-old son Eric (Trevor Morgan) from Isla Sorna. Probably won’t look as good on the small screen. (Until 11 p.m.)

10:45 (44) Live Aid: The Day the Music Changed the World. An oft-repeated selection of performances from the world-changing 1985 famine-relief concert that includes U2’s "Sunday Bloody Sunday," Paul McCartney’s "Let It Be," Eric Clapton’s "Layla," and Queen’s "Radio Ga Ga." To be repeated on Monday at 2:30 a.m. on Channel 2. (Until 1 a.m.)

11:00 (2) In the Life: Tax-Paying Citizens. This monthly gay-and-lesbian magazine-format show looks at lesbian Muslim women post–September 11, aging with AIDS, an LGBT youth group in Miami, and the battle for marriage rights in Hawaii. NYPD’s Bill Brochtrup hosts. (Until midnight.)

Midnight (2) Get Down Tonight: The Disco Explosion. It’s been all of two months since this last aired. With K.C. & the Sunshine Band and hosted by Frankie Valli, Karen Lynn Gorney (from Saturday Night Live), Denny Terrio, Barry Williams, and Irene Cara and "a mix of new live performances and classic clips." To be repeated on Sunday at 11:45 a.m., and on Wednesday at 1 a.m. (Until 2:30 a.m.)

SUNDAY 24

Noon (44) Liberty! The American Revolution. The Peabody Award–winning series from 1997 gets yet another fundraising afternoon in the sun. "The Reluctant Revolutionaries" is followed by "Blows Must Decide" at 1 p.m., "The Times That Try Men’s Souls" at 2 p.m., "Oh, Fatal Ambition!" at 3 p.m., and "The World Turned Upside Down/Are We To Be a Nation" at 4 p.m. (Until 6 p.m.)

1:00 (12) Auto Racing. Formula 1 back on network television? Yep, the Grand Prix of San Marino, which is actually run in Italy, at Imola, where in 1994 one of the circuit’s brightest-ever stars, Brazilian driver Ayrton Senna, was killed. Renault is in the ascendant after this season’s Þrst three races; Michael Schumacher and Ferrari are struggling. CBS will also show the Formula 1 events at Barcelona, the Nurburgring, and Montreal. (Until 3 p.m.)

1:00 (64) Star Wars Episode 4: A New Hope (movie). A new Star Wars movie? No, just the original 1977 George Lucas blockbuster retro-titled to Þt into the overall scheme. Harrison Ford, R2-D2, and C-3P0 show why they went on to become stars; Mark Hamill and Carrie Fischer show why they didn’t. (Until 3:30 p.m.)

3:00 (6) Basketball. More NBA Þrst-round playoff action.

3:30 (64) Star Wars Episode 5: The Empire Strikes Back (movie). The original 1980 sequel. We assume Fox is showing these to get you hyped for Episode 3, which will hit the big screen next month. (Until 6:30 p.m.)

6:00 (44) Magic Moments: The Best of ’50s Pop. Repeated from last month. A combo concert of old clips and "live on stage again just the way they were before you forgot them" reunions: the McGuire sisters, Debbie Reynolds ("Tammy"), Patti Page ("Old Cape Cod"), the Crew Cuts ("Sh-Boom"), the Four Lads, Aces, and Coins, and Gogi Grant. Plus tributes to 1950s icons Dean Martin, Perry Como, Rosemary Clooney, and Johnny Ray. Taped at Trump’s in Atlantic City. (Until 8 p.m.)

8:00 (2) Nature: Deep Jungle: Monsters of the Forest. From the rain forests of Borneo, Peru, Cambodia, and the Central African Republic. To be repeated tonight at midnight on Channel 44, and on Monday at 1 p.m. on Channel 44. (Until 9:30 p.m.)

9:30 (2) Mystery!: Miss Marple: The Murder at the Vicarage, part two. The A&E presentation of the Agatha Christie mystery, with Joan Hickson, was Murder at the Vicarage; this Geraldine McEwan incarnation is The Murder at the Vicarage. Is that some kind of clue? Probably not — the novel has appeared under both titles. But the current Penguin/Signet edition could have beneÞtted from some detective work: at one point it reads "Mrs. Protheroe" where Christie obviously meant "Mrs. Clement." (Joyce Millman’s review is opposite this page.) To be repeated tonight at 1 and 4 a.m. on Channel 44, and on Monday at 2:30 p.m. on Channel 44. (Until 11 p.m.)

9:00 (12) Locusts (movie). OfÞcial subtitle: "When You Hear the Buzz, It’s Too Late." Could that be a clue that this is a "2005 CBS Telemovie"? Lucy Lawless (Xena: Warrior Princess) stars as Dr. Maddy Rierdon, a "USDA voracious insect expert hoping to work on her struggling marriage when a locust outbreak erupts on both coasts of the United States," the result of a colleague’s misguided bio-engineering experiment. With Dylan Neil as Dan Rierdon ("Husband to Dr. Maddy") plus Mike Farrell and John Heard. (Until 11 p.m.)

MONDAY 25

9:00 (2) American Experience: The Fall of Saigon. A rebroadcast of the Þnal episode of the 1983 WGBH series Vietnam: A Television History, in observance of the 30th anniversary of the city’s surrender. To be repeated tonight at 1 a.m. on Channel 44, and at 4 a.m. on Channels 2 and 44, and on Tuesday at 1 p.m. on Channel 44. (Until 10:15 p.m.)

TUESDAY 26

8:00 (44) Islam: Empire of Faith: The Messenger, The Awakening, and The Ottoman. We’re 99 percent sure this is an encore presentation of a worthy series detailing the history of Islam. We’re only one percent sure (less, actually) President Bush will be watching. (Until 11 p.m.)

WEDNESDAY 27

8:00 (2) Cooking Under Fire. PBS goes reality on us with this "fast-paced" cookoff series whose winner will get a job at one of Todd English’s NYC restaurants. Todd himself will be judging, along with chef Ming Tsai and food writer Michael Ruhlman. To be repeated tonight at 3 a.m. on Channel 44. (Until 9 p.m.)

8:00 (44) BattleÞeld Britain: Battle for Wales, 1403. A re-creation of the Welsh independence movement led by Owain Glyndwr, whom you may remember from Shakespeare’s Henry IV part one. (Until 9 p.m.)

9:00 (10) Revelations (movie). Hour three. Jerry Jenkins and Tim LaHaye, authors of the bestselling "Left Behind" series, have called NBC’s attempt at the Apocalypse muddled and unbiblical. No kudos from the mainstream media, either. So who’s watching? (Until 10 p.m.)

THURSDAY 28

7:30 (2) Witness to Hope. The canonization of Pope John Paul II begins. Based on the George Weigel book. We wonder what note history will take of the late pope’s far more liberal predecessor, John Paul I, who died after just a month in ofÞce in circumstances that remain unclear. (Until 10:30 p.m.)

8:00 (6) Sweet Home Alabama (movie). Reese Witherspoon in an all right 2002 Þlm where she’s a New York designer who goes back home to get a divorce from her childhood-sweetheart husband (Josh Lucas) so she can marry the NYC mayor’s son (Patrick Dempsey). She doesn’t, of course, and she and her husband do all over again. Andy Tennant directs. (Until 10 p.m.)

9:30 (44) Eric Clapton’s Crossroads Guitar Festival. Repeated from last month. A sweltering show featuring Robert Cray, Vince Gill, Buddy Guy, Hubert Sumlin, John Mayer, Carlos Santana, James Taylor, Jimmie Vaughan, Joe Walsh, and ZZ Top. (Until 11:30 p.m.)