10 Exact Moments Video Game Heroes Became Villains
9. Cortana - Halo 5
Cortana is to Master Chief what Robin is to Batman. The two characters are the inseparable duo of the Halo universe, and Cortana's charm is what makes the ever-stoic Master Chief open up every now and then.
This is why when Chief's AI gal goes rogue in Halo 5 and decides to wage a war against all life in the universe, the decision comes off as a total and gut-wrenching shock to most fans.
Even though the game's setting is actually the perfect moment for her to turn evil.
Despite her sweet and human-like personality, Cortana is still an AI within the Halo universe, and in the Halo universe, all artificial intelligence has a short lifespan. The AI-based technology used by the humans is usually decommissioned after seven years because the machines tend to go mad from acquiring too much knowledge and then turn on their creators.
At the time of Halo 5, Cortana is more than eight years old, and she has collected data at an accelerated rate thanks to her time with Master Chief. She is at the perfect moment to finally turn on all organic life and want to wipe it out for being "bloodthirsty savages."
Skynet 2.0, here we come!