Cortana is an Artificial Intelligence construct created by Dr. Catherine Halsey (The creator of the Spartan-IIs). She is the Master Chief's companion throughout most of the Halo series.
Fan Casting
Daisy Ridley
Jenna Coleman
Nina Dobrev
Elizabeth Gillies
Alicia Vikander
Olivia Wilde
Angelina Jolie
Evangeline Lilly
Astrid Bergès-Frisbey
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