Cody completes Hate Machine for Adam, a cyber-weapon of mass destruction in the form of a program. Arbiter and Chief make an effort to stop him, paying a price they're not prepared to, and make discoveries there's no turning back from.

Master Chief gets he and Arbiter into big trouble with the Terms of Service Enforcement and Response Squad. A formidable new foe performs a field test of an extremely dangerous malware tool.

The '2001: A Space Odyssey' arc is over. Having awakened from their dream states, the toys find themselves alive and together once again within the confines of their owner Jon's bedroom. Chief's happy. Arbiter, on the other hand.

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 gamer tags and settle on tracking and taking out the youngest member of the clan first, Claire's killer -- Adam.

The Arbiter and Master Chief deal with a disturbing turn of events since Jon's return to the house. Adam moves forward with a secret and terrible plan. Claire recalls her last meeting with the Arbiter.

Arbiter learns the truth about Cortana's fate and confronts Chief.

With a list of 'leet hacks' at the ready, Arbiter and Master Chief prepare to take down the Donnovich wedding and stop Claire from making the biggest mistake of her life.

Adam and Kylie form an uneasy alliance in leadership of both Kylie and Clyde's hacker armies, the latter leader now having been taken out of play. Feeling that TOSERS has ruined the Halo Reach online experience, Chief decides he's had enough with the confines of Jon's bedroom.

Kylie wrestles with the loss of her clan and relationship with Adam in handling her partnership with him gone awry. The toys discover that Claire's hosting an online event on Halo Reach in memorial of them, believing them to be dead. Adam, now one of the world's most powerful crime lords, plots a number of attacks, one involving a devastating cyber-weapon.

With the ship hijacked by deadly Space Allen soldiers obsessed with violating the rear ends of all lifeforms throughout the universe to death and led by the terrible alien king Xanthar, Arbiter is forced to fight or die.

While playing a game of grifball online Arbiter and Chief are invited to the Halo in-game wedding of a grating player couple.

Master Chief wakes himself up early in the morning while the other toys are still asleep in order to go through with his mysterious plan previously interrupted by the Arbiter.

More is revealed from the fast-forward in time seen in the first episode of this season. In the present day, Arbiter continues his search for purpose while Chief seeks means of obtaining the Xbox One X and the Master Chief Collection.

As the toys continue to seek their purpose, an enemy approaches.

After forfeiting their lives to fiery oblivion, two action figures of the Halo series of games' principal characters the Arbiter and Master Chief having inexplicably come to life in 2008 find themselves in a parody of Stanley Kubrick's 1968 film 2001: A Space Odyssey -- a cargo ship traversing deep space, somehow taking place on the multiplayer stages of Bungie and 343 Industries' Halo: Reach for the Xbox 360. Chief, believing himself to be the ship's artificially intelligent robot PAL-9001, in a mission to discover the purpose of life, awakens the Arbiter, who suffers from amnesia and disturbing images of past tragedies.

The toys are back inexplicably in Jon's room after being dead for four years. While Chief searches for Jon's copy of Halo: Reach so he can play it and troll people online, Arbiter uses Jon's computer and internet connection to catch up on current world affairs.

Master Chief and the Arbiter target the remaining Chaos Theosis members on their hit list.

After a long absence, Claire returns online, eager to reconnect with the Arbiter. Eugene obtains dirt on Brody via Tyler.

PAL reveals the cause of the ship's high alert status to be the imminent failure of a critical component of the ship's communications system.

After PAL proves itself to be extremely dangerous, Arbiter takes drastic measures to disable the robot.

Master Chief and the Arbiter face off with Trent Donnovich, who has been revealed to be behind Chaos Theosis and their attack on the network.

In spite of PAL's unfounded misogyny, Cortana attempts to befriend the robot for the sake of the success of the crew's mission. With the two often at odds, Arbiter struggles with keeping the peace as well as his paranoia in light of the lethal contents of the ship's cargo bay and hallucinations of a mysterious stalker.

Cortana makes the executive decision as the mission's Captain to deactivate PAL, believing the assistant artificial intelligence system to be a significant risk to the lives of the crew. Arbiter's torn between his odd-couple friendship with the robot and his respect for Cortana as his friend and superior. Meanwhile, PAL may have other plans.

Arbiter attempts a life-or-death negotation with PAL.

A typical uneventful day for Master Chief and the Arbiter, a chronic arachnophobe, is turned upside down when a large tarantula finds its way into Jon's apartment.