TheHaloseries was in development for five years before being greenlit a year ago.

Showtime has dubbed it the cable networks most ambitious series ever.

The show will air in the first quarter of 2021.

LOS ANGELES, CA - SEPTEMBER 12: Natascha McElhone attends the premiere of Hulu’s ‘The First’ at California Science Center on September 12, 2018 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images) LOS ANGELES, CA - APRIL 28: Bokeem Woodbine arrives at the for your consideration event for FX’s “Fargo” held at Paramount Pictures on April 28, 2016 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)

Tibrina Hobson/Getty Images; Michael Tran/FilmMagic