"...'Halo 4' is the next blockbuster installment in the iconic franchise that's shaped entertainment history and defined a decade of gaming. Set in the aftermath of 'Halo 3', 'Master Chief' returns to confront his own destiny and face an ancient evil that threatens the fate of the entire universe..."
The original "Halo" series follows the interstellar war between humanity and a theocratic alliance of aliens known as the 'Covenant'. The Covenant worship an ancient civilization known as the 'Forerunners', who perished in combat with the parasitical 'Flood'.
The main trilogy centered on the experiences of the 'Master Chief John-117', a cybernetically-enhanced human super-soldier, and his artificial intelligence (AI) companion, 'Cortana'.
In this setting, the term "Halo" refers to 'Halo' megastructures: large, habitable ringed structures, similar to the 'Orbitals' in author Iain M Banks' "Culture" novels, and to smaller versions in author Larry Niven's "Ringworld".
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