Tracy, a nurse, begins work at the Jenner Institute, a seemingly quiet hospital and medical research facility in the English countryside. However, there is more to the facility than meets the eye.
After receiving a frantic phone call from Tracy (his girlfriend) at the Jenner Institute, journalist Peter Carson and the police arrive at the medical facility and make a horrific discovery.
A cover-up by the authorities means Peter has to seek out a former doctor at the Jenner Institute for information. Meanwhile, two children encounter and provide food for the creature.
A flashback reveals the genetic experiments of the Jenner Institute that led to the creation of the hybrid, 'Chad'. Peter, along with researcher Alison Wells, track 'Chad' to a farmhouse, with the army and authorities in pursuit.