In a snippet included in the trailer, the prince said, “There isn't anything else in the world that can bring you back from the darkest places than sport”.
Later on, he speaks of how sports not only changes lives on the “tracks”, but also “in the stands”.
The prince will speak about the Invictus Games, which he set up in 2014 for wounded, injured or sick armed services personnel and their associated veterans.
The duke's involvement in Rising Phoenix comes months after his wife, Meghan, narrated a documentary about a family of African elephants for Disneynature.
Rising Phoenix is directed by Ian Bonhôte and Peter Ettedgui and produced by Greg Nugent, John Battsek and Tatyana McFadden.
• 'Rising Phoenix' will be available on Netflix from August 26. For more information, visit Netflix's website