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'''''Halo''''' is a science fiction first-person shooter centered on Master Chief John-117, a Spartan super soldier whose C-spine is immobilized in a Halo vest, and his fight against the aliens known as the Covenant. Alongside his artificial intelligence companion Cortana, he not only defeats the Covenant and acquires an angel's halo, but is even acquired by Halo Headquarters to be the cleanup hitter for the Anaheim Angels.