Zack and his father are invited to join the Nebulon Navigators as they set out to return a lost baby pterosaur to the Prehistoric Planet, where Zack sees animals and plants he had only read about in books.

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.

Zack is happy to test a new android his father helped develop for Nebulonics before she goes into production, but her ability to learn causes problems when she develops a crush on Zack after watching a romantic movie.

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.

"Summer vacation is finally here, and Zack is pumped for space camp! He can't wait to play galactic games, tell scary stories, and go on crazy camping adventures with new friends. But when there's trouble between his cabinmates, it's up to Zack to bring everyone together. Will he be able to find a solution before the entire summer is ruined?"--Page 4 of cover.