At the height of his criminal career, the infamous Dr. H.H. Holmes designed his castle of horrors in Chicago, where he rented rooms to unsuspecting victims visiting the 1893 World's Fair.

Megabyte’s new plan to break into the SuperComputer by taking control of Bob’s neural interface goes awry when Enzo unwittingly drinks Bob’s spiked quantum shake.

Mainframe is raided by cyberpirates who take Bob hostage. Dot races the clock to catch the ship before they leave Mainframe.

Bob, Dot, Enzo and Mike the TV learn to work together when a group role-playing game lands on them.

Dot auditions acts for Enzo’s surprise birthday show while Bob tries to keep Enzo busy until the party starts.

When business is slow at Enzo’s new delivery service, he secretly accepts a job from Megabyte to deliver a package to Hexadecimal.

Fong temporarily distorts Dot’s reality to show her what Mainframe would be like if she were nullified.

A code master from the Net is searching Mainframe for a code master by the name of Tallon.

Hexadecimal tricks Megabyte into releasing an unstoppable viral bug that turns every sprite in Mainframe into concrete. Bob alone is immune and must find a way to turn things back.

Seeking attention for her art, Hexadecimal breaks into the Principal Office Archives and tampers with the paint program, using all of Mainframe as her canvas.