In lieu of execution, Linden Stiles submits to a military experience where he is injected with alien DNA. Fighting to retain his humanity, he finds himself hunted after he escapes using his new found super human strength.

Dr. Christina Markham has a mother suffering from Alzheimer's disease. When three apparently healthy young women age and die within hours, the Markhams are baffled and frightened. The solution comes after the older patients vanish.