After being driven to extinction, great bloodthirsty dinosaurs come back to life with the assistance of a demented genetic scientist. She plans to replace the human race with a super-race of dinosaurs who will not pollute the planet.

A team of scientists go to a nuclear mining facility to investigate a possible meltdown and instead find a large amount of cloned dinosaurs.

International terrorists get a surprise when their cargo turns out to contain living dinosaurs. The army commando team now have to think fast, if they want to prevent the extinction of the human species, instead of the reptiles.

When a series of unexplained vicious animal attacks strikes his community, Sheriff Jim Tanner and his assistant Barbara trace them back to a Dr. Hyde, a former military researcher whose government funding for a dinosaur cloning project was cut. When the Pentagon discovers Hyde obtained foreign backing to continue his experiments, they send in a strike team to save Tanner and Barbara and stop Hyde.

When industry spies break into a top secret lab at Calgorin Industries, they accidentlally let a T-Rex loose, which wreaks havoc into the lab before breaking out into the streets of Los Angeles.