When Jupiter notices a planet circling a far star, he enlists the other planets in our solar system to send a letter, but soon there is a disagreement on which, exactly, is the exoplanet.
When a cosmic storm hits, stranding the Nelsons on their new home planet, Nebulon, Zack's hopes of a white Christmas in Vermont are dashed, but Nebulon provides a surprising alternative.
Zack and Drake venture to Gluco, the candy planet, for some Easter fun but while competing in such activities as an egg toss and a three-legged race, Zack is so determined to come in first that he considers cheating to win.
In this adaptation of the traditional nursery rhyme, an astronaut swallows the Moon and other celestial objects, while two children ask questions about the Solar System and outer space.