A park ranger must face her fears as she becomes embroiled in a fight against an otherworldly threat.

A robotics company vying to win a lucrative military contract team up with a corrupt CIA agent to conduct an illegal live field test. They deploy four weaponized prototype robots into a suspected drug manufacturing camp in the Golden Triangle, assuming they'd be killing drug runners that no one would miss. Six doctors on a humanitarian mission witness the brutal slaughter and become prime targets.