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 is thrilled when his best friend on Earth, Bert Jones, visits for the weekend. But when Zack introduces Bert to Drake, his best friend on Nebulon, trouble begins!"--publisher.

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.

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?"--publisher.

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.