The live-action series is expected in 2020.

While no air date has been confirmed as of yet, the live-action adaptation of 'Halo' is gearing up for the production.

While the main role of Master Chief has been confirmed as Pablo Schreiber, the role of Cortana remained a mystery until now. Natascha McElhone has been announced as Cortana, the AI who helps Master Chief throughout his battles with the Covenant.

As well as this, McElhone will also play Dr. Catherine Halsey, the creator of the Spartan super-soldier program that created Master Chief. McElhone is probably best known for her role in 'Californication' opposite David Duchovny, or in the action thriller 'Ronin' opposite Robert DeNiro.

'Fargo' alum Bokeem Woodbine a privateer called Soren-066, described in the official statement as "a morally complex privateer at the fringes of human civilization whose fate will bring him into conflict with his former military masters and his old friend, the Master Chief."

As well as this, Indian actor Shabana Azmi will be play ONI head Admiral Margaret Parangosky, who appeared in 'Halo 4' and was mentioned in 'Halo 3: ODST'.

Three Spartans have also been cast, one among them being Irish actor and 'Catastrophe' alum Kate Kennedy. Along with Bentley Kalu and Natasha Culzac, Kennedy will play a Spartan super-soldier who'll likely join forces with Master Chief.

The nine-episode first season is scheduled to begin production in the coming weeks, with 'Peaky Blinders' director Otto Bathurst slated to direct the first episode of the series. 'Halo' has been a long time coming, with multiple attempts to get either a movie or a TV series off the ground.

While there have been some web series or short films, including 'Halo: Forward Unto Dawn' and 'Landfall' (directed by Neill Blomkamp of 'District 9' fame), 'Halo' is the first attempt at adapting the game franchise into a TV series.

No air date has been set for 'Halo', but it's expected some time in 2020.