While Vera adjusts to life as a virtual teenager, the Sourcerer reanimates an old enemy, advancing his mission to destroy the world.

Parker gives himself an unauthorized upgrade. Elsewhere, Megabyte seizes a digital fortress and starts building his Sentinel Army.

Megabyte delivers a distraction in the form of a deceptively cute cat virus while the Sourcerer prepares to launch a larger attack.

A curious sphere coughed up in the Codec reveals the surprising origins of the Guardian Code, sending Austin and Parker on a mission to look for more.

Wild mood swings threaten to derail an important mission after Vera installs a teenage plug-in to feel the full range of human emotion.

When Megabyte and his minions attack Virusylum, Trey is forced to make a difficult choice between sports and saving the world.

Vera convinces Austin's mom that technology can make her life better ... until a virus turns her virtual assistant, Alyx, into a big meanie.

The Guardians assemble to stop the Sourcerer from zapping the West Coast with a stolen weather satellite. In other news, Austin's mom is dating again!

It's a reunion of sorts when Megabyte joins forces with his evil sister Hexadecimal and the Guardians run into the original "ReBoot" characters.

The Sourcerer hacks a cellular network in an attempt to track down the real world location of the Guardians. Hexadecimal causes chaos. The Guardians retrieve another sphere and learn more about the Guardian Code's past.

Austin and Parker discover that Rowin works for the Department of Internet Security. The Guardians must stop the Sourcerer's Zombie Army botnet before he launches a massive Denial of Service attack.

When Megabyte infects Wubbly-Bee toys, the Guardians intervene using Parker's new Virus Extraction Tool. The Sourcerer takes over and turns the toys into ticking time bombs in the real world.

The Guardians try to stop a video from going viral that could expose their secrets. Googz and D-Frag are captured by Megabyte. Parker learns the truth about Trey and Vera.

The Sourcerer infiltrates the Department of Internet Security's secure network and accesses a nuclear missile site. Rowin enlists the Guardians to stop the Sourcerer from launching a nuclear warhead.

While Tamra hosts a teen vlog awards show, Shari finds Room 0 and digitizes into cyberspace as Enigma. When she is captured by Megabyte, Vector, D-Frag, and Googz attempt to rescue her, only to wind up prisoners themselves.

Trey tries to attract the attention of college basketball recruiters. Megabyte takes over Social Media City and begins his reign of terror in cyberspace. The Sourcerer heads to Quantum Heights to find the Guardians.

When the Guardians try to stop Megabyte and Hexadecimal from breaking out of Virusylum, Vector and Enigma are captured by DIS Special Agent Nance. Parker and Vera get Rowin to help D-Frag set Vector and Enigma free.

When the Sourcerer tries to break into Room 0, Austin and the others chase him off and learn the shocking truth about his identity. The Guardians head to the Deep Web to stop Pirate Phishing Trawlers controlled by identity thieves.

The Sourcerer tricks Austin, digitizes into cyberspace and hijacks the Codec, to trigger a Cyber Black Hole that will consume all of cyberspace. The Guardians must stop him before he succeeds in destroying the internet from within.