Casper haunts ABC; KCET has virtuous tales; a ‘Gift’ that gives peace;

Determination is the theme of this week’s episode of Adventures From the Book of Virtues (KCET, Sunday at 6:30 p.m.). Zach and Anne take off on a biking trail, determined to finish before sundown. But Zach sprains his ankle and he and Anne tell each other stories to bolster their resolve to get out of the forest before night. For ages 7 to 14.

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The little ghost Casper (ABC, Sunday at 7 p.m.) is kept busy when he helps the human owner of a crumbling mansion get rid of some not-so-friendly ghosts and tries to find a great treasure that might be hidden there. For the family.

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Ned saves his money so he can go to the circus with Linda on Ned’s Newt (Fox, Saturday at 7:30 a.m.). But when they find the lions un-scary, the elephants skinny and a seal that cannot balance, the animals get a pep talk from Newton, Ned’s 500-pound giant pet newt. For ages 6 to 11.

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On “Polo Phonies,” an episode of Field Trip (KCAL, Saturday at 9:30 a.m.), Zero and Pug stop quantum surfing for a while and get jobs as stable hands at a polo ranch. Zero befriends the smallest pony and helps her get a chance to play in the championship match. For ages 6 to 11.

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Diahann Carroll, Helen Shaver and Tisha Campbell star in The Sweetest Gift on “Showtime Original Pictures for Kids” (Showtime, Saturday at 7:30 p.m.). Two rural Florida families, one black, one white, have been neighbors for years but have kept their distance. But farm animals, children and grandchildren ultimately bring the families together. For the family.

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Disney Channel shows a sneak preview of episodes one and two of Bug Juice (Disney, Saturday at 8:30 p.m.), an original 18-episode series of summer camp experiences as seen through the eyes and anecdotes of nine boys and nine girls, all 12 to 15 years old. On the first day, they meet their bunkmates and have a campfire. On day two, they all take the dreaded swim test. The series premieres March 1 at 5 p.m. For ages 9 to 11.