The Giant's Dream: The Making of the Iron Giant
We are not sure of the release date for The Giant's Dream: The Making of the Iron Giant. It was released at the box office on 2016-09-06 so we estimate it was released to DVD in December 2016.
Director: Anthony Giacchino
Cast: Vin Diesel, Brad Bird, and Kevin O'Brien
A documentary about how the critically acclaimed film wound up being a box office disappointment, only to become regarded as a classic over a decade after its initial release.