OPIS
Animated series adapted from the original book, Halo: The Fall of Reach. It's an explanation and backstory of the shaping and creation of Spartan 117, The Master Chief.
Kidnapped as children and conscripted into a brutal military training and augmentation program, the Spartans were designed to be the ultimate weapon against chaos and insurgency—but when a dangerous alien alliance known as the Covenant declares war on humanity, the Spartans might be our only hope.