Making Halo 4: Return of the Forerunners
From Halopedia, the Halo wiki
<youtube width="300" height="200">bL8QP6hSU9A</youtube>
Halo 4: Return of the Forerunners is a video documentary by 343 Industries, about the development of the Prometheans and their weapons.. It was released on YouTube on September 12th, 2012.[1]