If you didn't buy the Digital Deluxe Edition, Limited Edition or Limited Collector's Edition of Halo 5: Guardians, you could not see the entire version of Microsoft's CGI animated film Halo: The Fall of Reach. That film is now available via Blu-ray, DVD, and VOD formats.
Here's the brief summary for the movie, which was created by the Vancouver-based CGI studio SEQUENCE:
"Adapted from the beloved Eric Nylund novel of the same name, this animated feature explores the dramatic origins and intrigue behind the SPARTAN program that propelled characters like the Master Chief and Dr. Catherine Haley into the pantheon of Halo lore. The story reveals the events that brought Master Chief and Blue Team together, including their Spartan training and their daring mission to strike back at the Covenant during the first days of the deadly alien invasion."
You can buy the Blu-ray and DVD dics versions via Amazon, and it's available for VOD purchase or rental from a number of different services and platforms.
Source: Xbox Wire