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.

On the planet Nebulon in 2120, Zack joins his school's Explorer's Club and visits Juno, a planet made of crystals, but he is less than thrilled when he is partnered with the class bully.

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 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.

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.

Although Halloween is not celebrated on the planet Nebulon, Zach, a boy from Earth, discovers that ghosts may be real.

"Zack is headed back to Earth for the first time since moving to Nebulon. He can't wait to see Bert and show his new friend, the former bully Seth Stevens, all around his old stomping grounds. When Zach's dog Luna escapes and goes missing, sightseeing plans take an unexpected turn. Will Zack find Luna before he has to head home to Nebulon?--

Will troublesome cabin mates ruin Zack's summer at space camp on the planet Sylvan?

"Picked to represent their planet Nebulon in the Interstellar Space Race, Zack and his friends navigate their specially designed car through an underwater maze, around planetary rings, and through the stars! But when trouble stirs within the team, Zack must take charge. Can he lead them to victory?"--

When Zack and his friends enter the Starcade gaming competition, Zack thinks it is all fun and games--until he realizes that the decisions he makes while playing the game starts to affect his daily life on Nebulon.