Stardate 47529.4: Doctor Bashir and Chief O'Brien board a ship above a planet whose populace had been wiped out by a genetic bioweapon, called Harvesters, to help to destroy the bioweapon used for a centuries long war. After many failures, the Kellerun and T'Lani, with the help of the DS9 crewman, are able to find the right radiation array that will destroy the weapon. Tragically, just as the last Harvesters are put in the radiation chamber to be destroyed, armed soldiers burst in and open fire. Bashir and O'Brien are able to fend off their attackers, but with more on the way their only option is to beam down to the planet's surface.