La stagione 1 di Zero Hour è stata trasmessa su History da dimanche 29 août 2004 a dimanche 19 septembre 2004. È composta da 4 episodi, il primo dei quali si chiama "Disaster at Chernobyl" e l'ultimo "Terror in Tokyo"..
This dynamic original series dramatizes the final hour leading up to several pivotal historical events, tracking happenings as they unfold, minute by minute. Using a real-time clock and a split-screen to follow key players, the series reveals the chilling lead-up to events that changed the world including the Chernobyl nuclear meltdown, 9/11 and the Columbine shooting.