Somewhere near the Texas-Louisiana border, the CIA maintains a force of domestic assassins. So secret is their work that their retirement program is a bullet in the head. Up-and-coming hitwoman, Diana, gets the order to dispatch Mars, a legendary CIA killer who's reached "retirement" age. She stalks him while he's in the bush leading a training exercise for recruits. Her pushy boyfriend Rick, also a CIA operative, insists on coming with her. Behind the scenes, a power play within the agency pits Ted Harmon against section boss George Marshall.

A mother obsessed with mind-altering televangelism consequently vomits a pulsating growth that slithers down the throat of her son during the night. Upon spewing the parasite, the son is driven by an uncontrollable force to murder and feed corpses to the now-multiple-toothed monsters manifesting throughout the house.