A day at the library turns into a cyberventure when Jackie, Matt, and Inez learn that Hacker has kidnapped Dr. Marbles, the only person who can save Motherboard from an evil virus!

Dr. Marbles is captured by Hacker and taken to Castleblanca, a Cyberspace version of Transylvania. Hacker's goal: transfer Marbles' brain power into his newly built robot named Megabyte! Summoned by Motherboard, the kids and Digit arrive with the knowledge that Hacker has taken Marbles to a castle, but which one? There are hundreds and hundreds of castles. To find Marbles, the kids must master the art of properly collecting data, organizing it and graphing the results - results that are sometimes surprising!

Wearing a disguise, Hacker lures Digit to a fantastic cyber amusement park and holds him captive. When the kids arrive, they analyze the games of chance, figuring out which games are fair and which ones are not!

Hacker steals the powerful sunisphere from Solaria, causing the cyberworld's sunny vacation paradise to be covered in snow! In a fun-filled chase across the snowy terrain, the kids discover the power and speed of estimation in order to recover the glowing orb from Buzz and Delete before the temperature reaches zero and the site freezes over forever.

Our Cyber-Team is transported to a Wild West site to prove that Hacker has taken a larger piece of land than he is allowed. Hacker is in jail and the trial is about to begin, but is his homestead really larger than what Judge Trudy will allow? The kids must discover how to measure the area of his irregularly shaped property in order to find the answer.

When the kids fail to stop Hacker from stealing Pandora's box in mythological Greece, they must solve a riddle and complete challenges to satisfy Zeus and earn a second chance. In the course of their adventure, Matt, Jackie and Inez discover that a fraction is a problem in sharing.