A new game show that appeals to discoveries; Sabrina goes abroad; it’s topsy-turvy in ‘CatDog’

Rolie Polie Olie (Disney Channel, Sunday at 8:30 a.m.) could be a reason to get up early with the kids: This gentle, 3-D computer-animation series with a beguiling Art Deco look is about a friendly planet full of happy little robot families. Also, it was created by acclaimed children’s author and illustrator William Joyce (“Dinosaur Bob,” “The Leaf Men and the Brave Good Bugs”). For ages 2 to 5.

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How much would a 1,200-pound cow weigh on the moon? What color would your blood be if Dracula dined on it--right out of your veins? That’s a sampling of the kid-oriented questions that contestants must answer on Zap It! (Discovery Channel, Sunday at 9:30 a.m.), a new game show where teams answer questions found on 500 make-believe TV channels on a huge video screen, using their “remotes” to control the action. For ages 7 to 14.

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Mystery, romance and more than a dash of magic are in store for a certain teenage witch when Sabrina Goes to Rome (ABC, Sunday at 7 p.m.). Melissa Joan Hart, who got a trip abroad for this on-location shoot, plays not only her Sabrina role but also one of Sabrina’s witchy ancestors, as she tries to solve the secret of an enchanted locket. Her wise-cracking cat Salem has stowed away for the trip and a cute American photographer provides romantic distraction. For the family.

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It always happens--the expensive toy lies forgotten, while the box it came in provides hours of play. That fact of parenting life inspired Out of the Box (Disney Channel, Monday at 10:30 a.m.), a new series featuring songs, dance, storytelling and other activities aimed at preschoolers. It revolves around the adventures of a group of children and their caregivers as they explore their world using imagination and creative play. For ages 2 to 5.

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It makes no sense, but in cartoons things don’t have to make sense. So meet CatDog, a single animal with two heads and two very different personalities (Nickelodeon, weekdays at 5 p.m. starting Monday). In the first installment, Dog gets fleas but Cat won’t climb in the bathtub to wash them away. For ages 6 to 11.

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Five heroic kids, each from a different war-torn planet, band together with a show tune-singing computer and a fuzzy alien named Splook to battle evil invaders of the universe in Brats of the Lost Nebula (WB, Saturday at 10 a.m.), a new sci-fi action series from the Jim Henson Co., using puppetry and hi-tech computer-generated imagery. For ages 6 to 11.