Ray O'Ryan

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.

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 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.

"Zack's twin sisters are best friends, but when the two get into an argument while visiting another planet, Zack finds himself stuck in the middle of a tricky twin situation"-- Provided by publisher.

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 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?-- Provided by publisher.

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

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.