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.

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.

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.

When his project malfunctions during the Intergalactic Science Fair, will Zack, a boy from Earth living on the planet Nebulon, be able get things under control before disaster erupts?

Zack loves everything about his new planet, Nebulon, until there is a complete cosmic blackout and he must try to function without his Indoor Robotic Assistant and hyperphone.

"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"--

"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?"--