Alcorn Pet Food Corporation is working with an experimental cat food laced with hormones and appetite enhancers. The special food causes cats to add muscle, gain weight, and exhibit extremely aggressive behavior. When an employee threatens to expose the pet food as a threat to public safety, she finds herself out of work, her home ransacked, and all her carefully gathered proof missing. Meanwhile, animal rights activists release the cats involved in the testing because they are scheduled to be euthanized. These bigger, stronger, and more aggressive animals begin to prey on small game in the area. Then the ravenous cats turn their attention to people. Lovers, runners, hunters, dogs, deer, rabbits, normal cats, and even motorists begin to fall victim to the predations of these enhanced felines. An unemployed scientist, a small special ops team, a grieving father, a chief of security, and a homeless veteran join forces to try to prevent a catastrophe.When a murderer steals the secret formula that created the menace and sells it to eight foreign enemies of the United States, the stakes suddenly get a lot higher, because the most deadly biological weapon ever created has just been released. The genie is out of the bottle and the world will never be the same. To make matters worse, the scientist discovers that the first generation offspring will be even bigger and more aggressive, and then they learn that the food also affects dogs and rats.