After the Arbiter plays a headache-inducing game with a few super serious Halo 3 players, Master Chief inquires about a mysterious package that has been delivered to Jon, the house owner, and discovers later that night that the contents of the package will change his and the Arbiter's lives forever.
Todd has stolen the love of Master Chief's life, and Travis has made a complete fool out of him. As a result, a disgruntled Chief approaches the Arbiter during an irritating game of Grand Theft Auto IV online and tells the Arbiter of his plans to teach Todd and Travis a lesson that they will never forget.
Picking up from where episode 11 left off, Todd, Travis and the Chief get into an epic rumble that eventually gets broken up by the Arbiter and Cortana. However, the next morning, Todd and Travis are nowhere to be found, and Cortana blames the Chief... but did he really have anything to do with their disappearance?
Master Chief and the Arbiter wait for the imminent release of the Halo: Reach beta. While the Arbiter is excited but perfectly willing to wait, Master Chief is not, and will take drastic measures to play it early.
Halo: Reach has finally hit store shelves, but Jon's copy has been lost during his move to a new apartment. While the Arbiter searches for it, Master Chief plays Modern Warfare 2 and encounters a JTAG-ging hacker.
It's Halloween, and after a late night of playing the Living Dead playlist, Arbiter tries to get some shuteye. However, Master Chief insists he get up early to play Infection custom games with him to celebrate the holiday.
Master Chief decides to apply for the TOSERS in-game police organization to have his online multiplayer access reinstated. Arbiter refuses to join him, unable to shake himself out of his depressive funk.
Master Chief collapses from exhaustion after a full day of moderating duty. The Arbiter can't sleep and decides to resume play through the night -- and a newly promoted Claire is assigned as his supervisor.
Master Chief and the Arbiter are in the belly of a private hacking server at severe risk of having their console irreversibly banned and must find a way out, but not without the hack files they came for.
Master Chief and the Arbiter, having pinned up mugshots of each member of the Chaos Theosis clan on the apartment's front door (their "hit list"), label each with their gamertags and settle on tracking and taking out the youngest member of the clan first, Claire's killer -- Adam.
Master Chief secretly orders and collects a mysterious package. Meanwhile, the personalities of the trio of trolls depicted in the glimpse of the future in the premiere episode slowly begin to unravel.
Arbiter further searches for ways of coping with his deterioration. Meanwhile, Master Chief pursues the woman of his dreams, Emma -- who merely spoke to him for thirty seconds and sent him a clan invite -- and Eugene punishes a player unfamiliar to him who has been trolling matches and forums poorly, falsely claiming to be a member of Eugene's clan in the process.
Following his first taste of rejection by a girl he fell in love with online, Master Chief falls further into a downward spiral. Meanwhile, Cortana and Greg confront Arbiter about his excessive drinking.
Master Chief struggles to place his accidental incineration of Cortana out of his mind. Arbiter, under the impression that Cortana had asked Greg's assistance in having her mailed to a children's charity, attempts to come to terms with the fact that she's gone. Greg, aware of the truth, is torn between confessing to Arbiter to clear his conscience and concealing the truth to keep the peace in the apartment.
Master Chief is forced to take action when Greg's guilt over concealing Arbiter from the truth regarding Cortana's disappearance becomes too much for him to handle. Arbiter is beckoned unexpectedly by an acquaintance for help.
The Arbiter, upset with Greg -- believing him to have helped Cortana mail herself away to a children's charity -- turns down his company in favor of playing online with the Chief and the duo's new friend, Eugene. The Chief struggles with nicotine withdrawl. Eugene and his trolling clan's co-moderators Tyler and Colin, now in possession of a new iteration of the Fragban software patch -- with the capability of issuing a console-level ban upon a fragged player -- begin wreaking havoc throughout the gaming network.
Eugene decides to confide in The Arbiter and Master Chief and reveal to them a secret, after which tension rises greatly between the toys. Greg, clueless what do with his knowledge regarding the truth of Cortana's demise, makes a radical decision. After throwing himself a party, the Chief experiences a traumatizing sight.
Emma, the leader of a purist trash-talk-free gaming clan (who shot down Chief, who believed the two of them were in a relationship), attempts to inflate the faith of her members despite the clan's modest interest to the public and recruitment figures. Tyler, at last in the possession of the perma-banning Fragban software patch, wreaks havoc online. Tensions rise between he, Eugene and Colin after Colin makes a controversial announcement. Eugene enters a heated exchange with his father. The toys are at odds over the participation in the banning of players with Eugene.
Brody, the bullied online role-player who attends the same high school as Eugene and Tyler, approaches his friend Kyle in the pair's frequented server and offers a concerning proposition. Eugene and Arbiter chat privately; Eugene apologizes for he and Arbiter's earlier conflict over the use of the Fragban software patch, and an in-depth discussion follows revealing of the two's troubled lives and personal beliefs.
The toys accept the gift of the Fragban 2.0 software patch (with the capability of banning players upon fragging them) from Eugene, and wreak havoc throughout online matchmaking with it after Colin gives the clan the green light to proceed with its usage.
Six weeks have passed since the toys acquired the Fragban software patch from Eugene. Arbiter continues to deteriorate. The toys are informed by Eugene of an imminent memorial service for a deceased teenage gamer to be hosted online and in-game.
Having finally discovered the usage and purpose of the console-bricking software they stole from Tyler, Brody and Kyle find themselves at odds over whether to use the files to ban Eugene or submit them directly to the administration in the hopes that a firmware fix will be developed. Eugene, Tyler, Colin and the toys await the start of the memorial service (seen in the season's premiere episode).
A jarring glimpse of two weeks into the future teases a terrible fate for the toys. Following the memorial service crash, the toys find themselves at the peak of their happiness. Eugene and Tyler obsessively await Brody's reappearance. Arbiter has a revealing conversation with Colin.
Following the banning of the toys and the news of Madeline's abrupt passing, Eugene suggests he, Tyler and Colin get the most out of Fragban while it's functional by initiating a merciless banning rampage. Meanwhile, Master Chief decides to put Colin's private IRC server info received from Peter, the young boy who was under the threat of sexual assault, to worthwhile use.
Arbiter confronts Chief to learn of Cortana's true fate after discovering her base plate buried in the box of junk at the bottom of the hallway closet, where Chief had hidden it after accidentally incinerating her. The apartment receives unexpected visitors.