SHOWS FOR YOUNGSTERS AND THEIR PARENTS TOO : New adventure in Robin’s ‘Hood’ on TNT; a 1981 Cosby concert on Showtime

The wee folks living on Fairy Hill feel threatened when the son of the hill’s owner plans to turn their home into a theme park in Leapin Leprechauns! (Disney Channel, Sunday at 7 p.m.). For ages 4 to 10.

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Little John (Richard Ashton) has fallen under the spell of three witches in the “Witches of the Abbey” episode of The New Adventures of Robin Hood (TNT, Monday at 7 p.m.). Robin (Matthew Porretta) must fake his own death and be entombed in the family crypt in an effort to save his pal. The shows repeat each Saturday at 5 p.m. For ages 10 to 15.

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Bill Cosby-Himself (Showtime, Wednesday at 11:30 a.m.) is himself as he was in 1981, during a concert taped before a live audience in Ontario, Canada. For the family.

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When Margaret plans a celebration for her husband Bob’s 40th birthday, she underestimates the impact that middle age will have on his mood in the animated short Bob’s Birthday (Cartoon Network, Wednesday at 6:30 a.m.; repeats 7:30 a.m. on Sunday). Beginning March 5, Cartoon Network is presenting “O Canada,” animated films produced by the National Film Board of Canada. For the family.

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Olympic gold medalist Scott Hamilton leads a group of super-skaters onto the ice in Disney’s Scott Hamilton: Upside Down (CBS, Saturday at 8 p.m.). Kurt Browning, Ekaterina Gordeeva, and Kristi Yamaguchi entertain. For the family.