Richard Denning stars as a scientist investigating a small Mexican village that’s been wiped off the face of the Earth. It turns out giant scorpions are to blame. They also take time out to derail a train. Denning finds a nest of them hiding out in a cave and destroys them, but one gets loose and attacks a city. The army is called in to help, and they corner it in a stadium. Denning busts out an electric harpoon and tazers it’s ass dead. Willis (King Kong) O’Brien did the effects, and while the stop motion special effects for the scorpions are good (although the scene of the scorpion attacking a helicopter is shown over and over), the close ups of their giant slobbering faces are more effective.