Sheriff Jim Tanner (Eric Roberts) and his assistant, Barbara Phillips (Melissa Brasselle), must investigate lethal attacks on local residents that appear to have been inflicted by dangerous animals. The attacks prove to be a result of Dr. Hyde's (Corbin Bernsen) confidential laboratory experiments, which involve raising various types of dinosaurs. The repercussions of his experiments are deadly, and Jim and Barbara have to fight to survive while the military tries to intervene.