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Halo: The Television Series was announced on May 21, 2013 at the Microsoft reveal of the Xbox One and it has been in development hell for five years as of 2018. The series was said not to be exclusive to a new TV service on the console, and Microsoft confirmed that Steven Spielberg will be Executive Producer. The budget and production value should resemble those of HBO's Game of Thrones. Microsoft's president of entertainment and digital media, Nancy Tellem, said they will take the time necessary to produce the shows and Microsoft Studios corporate vice president Phil Spencer said the show will not be "filler." The series was also stated to have narrative connections to Halo: Nightfall during this time.
On June 18, 2018 it was announced that Showtime has ordered a 10-episode season. Kyle Killen will serve as executive producer, writer, and showrunner, while Rupert Wyatt will direct several episodes and also serve in the role of executive producer. Scott Pennington will also executive produce the series, alongside Amblin Entertainment's Justin Falvey and Darryl Frank. The series will be distributed globally by CBS Studios International.
During the Television Critics Association press tour, Showtime president and CEO David Nevins and president of programming Gary Levin revealed that John-117 will appear in the series. Levin stated, "It is a key question and an important part of our series. He is a lead character." He also said that the series will focus on a new story and delve deeper into the backstories of characters, but that they are working with Microsoft 343 to make sure they don't violate the existing canon of the Halo universe.
- Pablo Schreiber as John-117
- Yerin Ha as Kwan Ha 
- Natasha McElhone as Catherine Halsey and Cortana 
- Bookeem Woodbine as Soren-066 
- Shabana Azmi as Margaret Parangosky 
- Bentlet Kalu as Vannak-134 
- Natasha Culzac as Riz-028 
- Kate Kennedy as Kai-125 
- ↑ 1.0 1.1 Halo Waypoint - Showtime Announces New Halo TV Series Details
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Xbox.com - SHOWTIME, Amblin Television and 343 Industries Bring Halo to Television
- ↑ IGN.com - Halo TV Project Revealed
- ↑ TheVerge.com - Microsoft announces live action 'Halo' TV series with Steven Spielberg as executive producer
- ↑ OXM - Halo is our "most important IP," says Microsoft - TV show won't be "filler"
- ↑ Gigaom.com - Bonnaroo, Halo and soccer: Microsoft aims high with Xbox Originals
- ↑ IndieWire – ‘Halo’: Master Chief Will Be a Character, and Series Goes ‘Beneath the Formidable Armor of the Spartans’
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Gamespot - The Halo TV Adaptation Casts Cortana And Many Other Characters