Mainframe begins to crash around them and users from games played break out into mainframe. Matrix meets up with an enemy from his past.

Mainframe is all but destroyed and Bob realises that their only hope lies in the user.

The battle for Mainframe begins and Matrix has a final confrontation with Megabyte. Meanwhile, Hexadecimal seems to have gone even more insane but Bob thinks he might be able to help her.

The joy of receiving a new upgrade is cut short when it turns out to contain Megabyte himself, who's decided to take a more direct approach to infecting the core.

Mainframe is thrown into utter chaos when Hexadecimal manages to tap into the system's paint function.

Matrix is shocked when he finds Mainframe inside a game cube. Dot is there... Phong is there... even Bob! But why did he and AndrAIa reboot as Megabyte and Hexadecimal? And who is Number One?

Above Mainframe hangs the web creature's parting gift: A gigantic portal to the Web - a chaotic abyss filled with unspeakable horrors. It will take the combined might of all inhabitants of the system to close it, including the viruses, but can they be trusted?

With Dot stuck in a game, heavily depressed and about to give up, Phong decides to take drastic action, sending her into a possible future where she lost the game and got herself and Bob nullified.

A being of incredible power, known as a codemaster, arrives in Mainframe, demanding they bring out another codemaster who he believes is hiding there.

Dot is arranging a celebration for Enzo's first birthday, and Bob has to keep the young sprite occupied until everything is ready.

The Saucy Mare is attacked by a group of degraded sprites riding web creatures, and AndrAia is saved by an old friend.

The traps Mouse once placed to stop the web creatures from accessing Mainframe are now making it difficult for the sprites to return home.

While most of the gang battle Rocky The Rabid Raccoon in a game, Glitch Bob struggles to find a way to separate himself from glitch, and Dot follows her heart.

The battle against Daemon continues, Hexadecimal turns into a sprite, we learn more of the character's pasts, the nulls form an old friend, and Turbo has been infected by Daemon.

Frisket swallows an unformat command Megabyte had just uncovered. Wanting to get it back, the virus has Enzo kidnapped, using him as bait to lure the dog into Silicon Tor.

After Bob makes Dot late for an appointment, she and Bob get into a big argument. Seems Dot suddenly thinks Bob is too "random", and Bob thinks Dot is too straight-laced. Enzo and the other citizens of Mainframe try to trick the two into making up, but nothing seems to work. When Bob and Dot get trapped in a game cube, will that be enough of a crisis to get them to stop squabbling?

Mike the TV is driving everybody insane, but when a game cube drops and Mike reboots into a warrior they're going to need him to help stop the user.

Megabyte steals Hexadecimal's precious Medusa Bug but finds it to be a trap which turns everything in Mainframe to stone.

Mainframe is attacked by dastardly software pirates, who quickly scavenge the city, taking everything of worth - including Bob!

After Bob upstages him during a game, Enzo decides to get smarter in a hurry. The Read-Only Room at the Principle Office is too much like work for the young sprite, so he's tempted into tinkering with the system clock. Only instead of making himself twice as smart as everyone else in Mainframe, he accidentally makes everyone else half as smart! What's worse, he ends up trapped in a game cube with a bunch of his dumbed-down friends. Can Enzo best the user by himself and fix this mess?

After getting stuck in a game, Matrix, the hardened and cynical warrior once known as Enzo, and AndrAIa have been wandering the net for a very long time, moving from system to system through the games, searching for a way back to Mainframe. This time they arrive in a barely functioning system, devastated by virals and constant lost games.

The two Bobs try to figure out which is the original and which is the copy. Dot can't decide which one to choose. A game cube drops placing Matrix, Frisket, and Normal Bob into a Pokémon style game.

The infected Megabyte merges with Hexadecimal, turning into the energy devouring super-virus Gigabyte. It must be stopped before it gathers enough power to create a portal to the Net.

Megabyte tries to blackmail Bob into stabilizing a tear into a portal to the super computer. As Bob makes an escape with the help from Dot the user inserts a game which stabilizes the tear. Bob and the rest of the sprites must race Megabyte, who has infected the user, to the portal to win the game and keep him from gaining access to the super computer.

Megabyte is trying to turn Mainfraime against Enzo, blocking him from entering the games and smearing his reputation with propaganda. When the young guardian finally manages to sneak past the blockade, it's more crucial than ever that he wins, this time facing Rocky the Rabid Raccoon...

Daemon continues to infect more and more citizens of Mainframe, we discover more about Bob's past and his first coming to Mainframe, Bob's condition worsens, and Daemon learns about love.

Megabyte is draining energy from the games to fuel his attempt to breach the Mainframe archive's protective barrier. But when he takes too much, the game crashes and merges with a new one, trapping him and Bob inside the chaos.

The crew of the Saucy Mare enter the web looking for Bob but when a web creature sucks away half of AndrAIa's energy, leaving her in a dying state, Matrix must find the creature so he can save her life.