In San Antonio, a run-down city in Texas, four friends including Mike (Phillip Wolf), Kenny (Matt Hensarling), Barbie (Tory Tompkins) and Sissi (Ali Faulkner) have just finished a happy birthday party. They drove past a convenience store, and Barbie had a dispute with two young people in the store. The flamboyant girl scratched the other's car, which caused the two young people to drive and chase after them. The two cars chased madly on the dark and silent road, but accidentally hit and killed a black dog crossing the road. The black dog belonged to a group of cold-blooded and fierce men. Mike and his men did not stop and continued to run away, while the two young men were brutally killed and dismembered by the other side. Another group of men drove to chase Mike and others, and the originally happy birthday night turned into a terrible killing feast...