Halo season 2 will have to find a way to separate Cortana from Master Chief, but there are plenty of ways to make that happen. Based on the hugely popular video game series, Halo is the first live-action incarnation of the property featuring the game's main character, Master Chief, aka John-117 (Pablo Schreiber). Halo also features another fixture from the game, which is the AI known as Cortana. The CGI character in the show is voiced by Jen Taylor, who has provided the voice for Cortana throughout the game series.
In Halo season 1 it's revealed that Dr. Halsey (Natascha McElhone) has the intent of the Cortana AI being the next evolution of the Spartan program, which would have the enhanced humans fully controlled by AI. Dr. Halsey has Cortana installed into Master Chief's brain, where she begins her relationship with him in similar fashion to the games, but with far more growing pains than has ever been explored. Cortana is a learning AI, meaning that it evolves over time, gaining sentience along the way, which begins almost immediately in the show. Cortana comes to reject Dr. Halsey's plan to take over Master Chief, wanting only to help him, rather than control him.
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In the Halo season 1 finale, as Master Chief is overwhelmed with soldiers from The Covenant and the rest of his team defeated, he turns to Cortana and asks her to take over, knowing it's the only way to defeat the enemy. Reluctantly, Cortana takes over Master Chief's consciousness and is able to take out the encroaching enemy, which seemingly erases John-117, leaving the AI in complete control—Dr. Halsey's plan all along. As the Spartans make their escape, Kai-125 addresses Master Chief,
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