A group of soldiers and a journalist are tasked with rescuing a scientist whom high command regards as crucial in putting an end to the zombie epidemic. The soldiers manage to rescue the scientist, who reveals to them that he was part of a team developing an experimental orbital cannon that can be used to wipe out large swarms of zombies in a single shot. 

The soldiers then accompany the doctor to the facility where the weapon can be fired and manage to protect him long enough to activate the weapon and escape. While flying away from the facility, the group witnesses the devastating firepower of the orbital cannon, which wipes out a large zombie swarm which overrun the facility.