Master Chief (Pablo Schreiber)

Master Chief Petty Officer John-117, more commonly known as, Master Chief, is a member of the UNSC's Spartan program. He is also a member of FLEETCOM, the Asymmetric Warfare Research Group, leader of the Silver Team, and a Blessed One.

John is Earth's most advanced warrior in the 26th century and the only hope of salvation for a civilization pushed to the brink of destruction by the Covenant, an unstoppable alliance of alien worlds committed to the destruction of humanity. While fighting to obtain the keystones from Covenant forces, Master Chief allowed Cortana to assume full control over his body to save the Spartans.