Day One was a planned NBC sci-fi television movie – originally a television series pilot – about apartment residents that survive an unknown worldwide cataclysm[1] that destroys modern infrastructure.
The show was originally expected to fill the Heroes time slot, in March 2010, after the 2010 Winter Olympics.
While originally intended to air on NBC midseason in the 2009–10 television season with a thirteen-episode order, it was reported on October 1, 2009, that the episode order had been reduced to four and would air as a mini-series.
[3] On January 10, 2010, it was announced that the order had been reduced to a pilot, which would air as a television movie.
The NBC President of prime-time entertainment told the Television Critics Association that "it will be a pilot where you could see where it could go in series, but there will be a resolve at the end of the two hours.