halo is a military science fiction first-person shooter video game franchise created by bungie and now managed and developed by 343 industires, a subsidary of microsoft studios.

the series centers on an interstellar war between humanity and a theocratic aliiance of aliens known as the covenant. the covenant, led by thier religious leaders called the prophets, worship an ancient civilization known as the forerunners, who perished in combat with the parasitic flood.

the central focuses of the franchise builds off the experieneces of master chief john-117, one of a group of supersoldiers codenamed spartans, and his artifical intelligence (AI) companion, cortana.