Hal thinks there is a mug breaker around when Nature Cat and Ronald find their favorite mugs broken; Hal dreams he is a bird.

The group celebrates Earth Day by notifying a supermarket that its plastic bags are blowing around Butterfly Hills; the gang tries to get a plastic bottle out of a stream.

The Fred Rogers Company introduces a new animated preschool series featuring Peg and her sidekick, Cat, as they encounter unexpected challenges that require arithmetic and problem-solving skills. Each episode features two stories in which Peg and Cat face a math word problem that they must solve. Children will learn how to build calculation skills and think about larger concepts that will help them form the foundation for learning math at any level, from kindergarten through calculus.

The first series inspired by "Mister Rogers Neighborhood," "Daniel Tiger's Neighborhood" features 4-year-old Daniel Tiger, son of the original program's Daniel Striped Tiger. Every day Daniel puts on his red sweater, ties his shoes, and invites a new generation of preschoolers into the Neighborhood of Make-Believe. Daniel shares his daily adventures with pals O the Owl, Katerina Kittycat, Prince Wednesday and Miss Elaina. With the help of Daniel and his friends, preschoolers have fun and learn practical skills necessary for growing and developing.

This show follows the adventures of animated versions of brothers Chris and Martin Kratt, hosts of such educational shows as "Kratts' Creatures" and "Zoboomafoo." In the show, the animated Kratts encounter wild animals during stories of adventure and mystery. The live-action Kratt brothers introduce each episode.

Martin Short provides the voice of the title character in this animated series from PBS Kids, which aims to promote children's literacy in science. It follows the magical adventures of 6-year-olds Nick and Sally, who travel the world with the Cat in the Hat as their guide. As they travel in the Cat's customized vehicle, the Thinga-ma-jigger, which can float, fly, drive and even ski, they learn about natural science, visiting the rainforest, the bottom of the sea, and all places in between. They're joined in their travels by the Cat's mop-headed sidekicks, Thing One and Thing Two.

A yellow fusilier fish named Splash and his friend Bubbles, a Mandarin dragonet, explore life under the sea with their pals in "Splash and Bubbles," the newest series from PBS Kids. Co-produced by The Jim Henson Co., the animated series is designed to teach children aged 4-7 about marine life and the ocean and help them build social-emotional skills. The series features the voices of John Tartaglia (who also created the series), Leslie Carrara-Rudolph, Raymond Carr and Aymee Garcia.

Earth science and astronomy take center stage in this animated series from PBS Kids. Two neighborhood kids -- Sean and Sydney -- befriend the new kid on the block, Jet Propulsion, who just happens to be an alien from planet Bortron 7. Together they explore the solar system and how it affects the planet, while also learning about friendship and teamwork. The series features live-action interstitials with astronomer Dr. Amy Mainzer.

Four fairytale friends go on magical adventures and become reading-powered superheroes. The characters live in Storybook Village, which is accessible through a panel that is represented by an invisible question mark. Preschool children follow the Super Readers as they jump into books that come to life.

Bespectacled aardvark Arthur Read demonstrates to kids how to deal with such childhood traumas and challenges as homework, teachers and bullies. He also has to contend with his sisters, but loves playing with his friends: tomboy Francine, foodie and best pal Buster, supersmart Brain, rich girl Muffy and geography expert Sue Ellen.