Eleven-year-old Joshua Higgins' prize-winning science fiction novel draws the attention of sinister blue aliens who capture Josh and his sister Maggie and take them to the planet Yastrol, the setting of his novel.

Zack is shocked to find a large, green, six-eyed creature sitting in his place at school one morning, but soon learns that he and the "monster" have a lot in common.

Aspiring author Josh writes about an ideal vacation planet, hoping that he and his sister Maggie can travel to outer space safely and have summer fun, but he does not count on encountering the creatures that are already living there.

"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" --

"When summer arrives on Nebulon, Zack discovers that his best friend, Drake, is afraid to learn to swim and decides to teach him before they go on a trip to water-covered planet Araxie" --

Young alien agent Zack, surly Galactic Patrol Cadet Vraj, and shy human camper Opal team up to find some Duthwi eggs before they hatch and cause a planetwide disaster, while the Gnairt who were smuggling the eggs try to retrieve them.

So far the AstroNuts have failed to find a suitable planet, but NNASA has come up with a new plan: send the the four animal astronauts back through time on Earth where they are to contact early homo sapiens and somehow set them on a path to a sustainable future--trouble is, humans seem inferior to many of the other species (especially the wolves), so the AstroNuts come up with a Survival of the Fittest Olympics, hoping that with a little help the...

On their second mission to find another habitable planet, the four mutant animals, LaserShark, AstroWolf, SmartHawk, and StinkBug, splash land on the Water Planet, run by some suspiciously friendly clams, who are very eager to swap planets--and if the AstroNuts can stop arguing among themselves they may find out why before it is too late.

Alien agent Zack travels to Roswell, New Mexico, to search for an alien boy who's stolen a space ship in order to find his missing father, who crashed near Roswell in 1947.

On a trip to a pond with a local nature group, twins Josh and Danny accidentally eat a muffin laced with Petty Potts' SWITCH spray and are transformed into very stinky beetles.