Dinosaurs were once the kings of the world, and research was done to weaponize them. Starting with theme parks to fund their operations, bio-weapons company Hybreed has now started to create monsters. The king of dinosaurs, Tyrannosaurus Rex, was recreated in project Hybrid T-Rex and was sent out to a demonstration facility. The hybrid is enhanced with special mutant genes extracted from numerous animals, making it larger and more powerful than the original T-Rex.

During transport, however, the T-Rex broke free and now rampages across the city. The humans have sent out their soldiers and military weapons, but the dinosaur isn't so easy to stop. Using its many genetic enhancements, it adapted to the weapons and became stronger. The military deploys their infantry, combat trucks, helicopters, and even tanks. Police on the scene can do little to slow the dinosaur king down. Will the rampage ever end?