Set just before the start of Armageddon, the series will follow two central characters, a physicist and a nun, who are racing against the clock to see if the end of the world apocalypse can be averted. Bill Pullman plays Dr. Richard Massey, a Harvard professor whose daughter is murdered by satanists while McElhone stars as a nun who recruits Massey to help investigate whether what's told in the Book of Revelations is starting to come true. Seltzer and Polone with executive produce the project along with Pariah Television's Vivian Cannon and Jessika Borsiczky.

"24" is a TV thriller presented in "real time" with each minute of airtime that corresponds to a minute in the lives of the characters. "24" employs fast-paced and complex stories, and often contains unexpected plot twists. Though each day's events typically revolve around thwarting an impending terrorist attack, each season is made up of various interwoven story threads. These may run for just one hour, but more usually run over several hours. These typically involve investigations of leads on terrorists, tracking suspects, and averting attacks. The exact objective of the day evolves over the course of the season as the antagonists adapt, contingencies arise, and larger scale operations unfold.