Sudden, inexplicable attacks by cats on their human owners resulting in death and mutilation, surge through a metropolis. A young hospital intern, Dr. Howard Glass (Sean Kenney) and his nurse assistant Angie Robinson (Monika Kelly) seek the answer when her own pet feline assaults Glass without provocation. They theorize that an exotic canned cat food could be the cause after learning a fatally bitten woman's pet and Angie's ate the same brand. The food has turned partaking cats into man-eaters! Sleuthing eventually takes Glass and Angie to a dingy factory where the cat food is manufactured by two diabolical partners, Landau (Sanford Mitchell) and Maltby (J. Byron Foster). The basic ingredient consists of cadavers supplied by an accommodating but disreputable cemetery caretaker Caleb (Warren Ball) and his wife Cleo (Ann Noble). It is in the factory that shirring power saws, red stained chopping blocks, ominous cauldrons and a vociferous grinder transpose human flesh and bone into pussy cat puree. Desperate for fresh supplies of human flesh, Landau and Maltby ply skid row alleyways to fill the demand. For good measure they include the caretaker when Caleb insists on payment for his raw stock. Glass and Angie arrive at the factory on a ruse to get food samples for laboratory analysis, but are outsmarted by a suspicious Landau. A determined Angie nevertheless on her own returns late at night, sneaks in, but is trapped by Maltby, who, in the absence of Landau, is about to abscond with his withheld share of the profits. Angie is strapped on the conveyor leading into the grinder. Maltby's lecherous advances halt when Landau unrepentantly appears. A startled Maltby accidentally hits the controls, is dragged onto the running conveyor ahead of helpless Angie toward the flashing tips of the grinder knives. Meanwhile, Glass has alerted authorities. While he and the police, sirens screaming, converge on the factory, a maddened, fiendish Landau proceeds to aid his partner's demise. A freed Angie attempts to evade Landau's clutches as he himself is ironically caught and headed for the grinder, only to be devoured by a band of ravenous cats. Glass releases Angie.