| Episode | Title | Major Event | |---------|-------|--------------| | 1 | “Contact” | Chief removes pellet, refuses to kill a child, goes AWOL. | | 3 | “Emergence” | Cortana is created from the Keystone. | | 5 | “Reckoning” | Chief kills a fellow Spartan (not in games). | | 8 | “Allegiance” | Chief & Makee have sex; Covenant attacks Reach. | | 9 | “Transcendence” | Chief activates Keystone, finds Halo ring. |
Set in the year 2552, humanity is locked in a desperate struggle for survival against the , an alliance of dogmatic alien races.
One of the first major decisions made by showrunner Steven Kane was to set Halo Season 1 in the "Silver Timeline." This is a parallel universe to the core video games (Combat Evolved, Halo 2, Halo 3). This creative choice allowed the writers to break from lore constraints while keeping the visual aesthetic intact.