Countdown to Zero Hour. After a surprise attack on Earth leaves over seven million people dead, Captain Jonathan Archer (Scott Bakula) and the crew of the Enterprise swear to find those responsible - the Xindi. Taking off into the uncharted region known as the Delphic Expanse, the crew of the Enterprise must hunt down the Xindi and stop them from enacting their ultimate plan: the total destruction of humanity. Along the way they travel to the year 2004 to prevent a bioweapon attack, fend off the mysterious Sphere-Builders, and even meet their own descendants due to a wormhole mishap - all leading up to a desperate race back to Earth to prevent its destruction. Audio Commentary, Deleted Scenes, " In A Time Of War", "Temporal Cold War: Declassified", Archival Mission Logs.