Halo is a science fiction video game series created by Bungie Studios. The Halo video game trilogy centers around Master Chief Petty Officer SPARTAN-117, or simply "the Master Chief", a human cyborg super-soldier equipped with technologically-advanced battle armor, and his Construct AI companion, Cortana. The video games, particularly Halo: Combat Evolved, have been praised as being the best, and most influential, first-person shooters of all time. This has led to the term "Halo killer" being used to describe video games that aspire to be better than Halo.