A wealthy entrepreneur secretly creates a theme park featuring living dinosaurs drawn from prehistoric DNA. Before opening day, he invites a team of experts and his two eager grandchildren to experience the park and help calm anxious investors. However, the park is anything but amusing as the security systems go off-line and the dinosaurs escape.
A researcher at Chicago's Natural History Museum returns from South America with some crates containing his findings. When the crates arrive at the museum without the owner there appears to be very little inside. However, police discover gruesome murders on the cargo ship that brought the crates to the US and then another murder in the museum itself.
After her younger sister gets involved in drugs and is severely injured by contaminated heroin, a nurse sets out on a mission of vengeance and vigilante justice, killing drug dealers, pimps, and mobsters who cross her path.
A female cop is gunned down and wrongly accused of using excessive force in a hostage rescue attempt. Maniac cop returns from the dead once more to seek revenge, destroying everthing and anyone that stands in his way.