Enredo

Genetically mutated bats escape and it's up to a bat expert and the local sheriff to stop them.

Bats, the result of a government experiment gone wrong, have suddenly become intelligent, vicious, and omnivorous, and are attacking people near Gallup, Texas. Bat specialist Sheila Casper and her assistant Jimmy are brought in but can they stop the bats before the military comes in and, in their ignorance, makes things worse?—Jon Reeves <jreeves@imdb.com>

There is a biological emergency...so bad that the Center for Disease Control has interrupted Dr Sheila Casper's [Dina Meyer] field research in the bat caves of Skull Valley, Arizona to fly her to Gallup, Texas. Six days ago, two genetically-altered flying foxes broke free from Dr Alexander McCabe's [Bob Gunton] research laboratory. At first, they killed only animals, but now they've begun feeding on humans. Sheila Casper, a wildlife zoologist who specializes in bats (Chiroptera), has been called to help find the pair before they kill more humans or contaminate other bats in the area.

Aided by Sheriff Emmett Kimsey [Lou Diamond Phillips] and CDC specialist Dr Tobe Hodge [Carlos Jacott], Sheila and her assistant Jimmy Sands [Leon] begin to search for the bats' roosting area. The first night out, Emmett and Sheila are attacked by a horde of them. They are able to capture one of them and plant a homing device under its skin. When they set it free, however, hoping that it will lead them to the roost, it is attacked and killed by the other bats, as though they knew it was a plant. Apparently, these bats have been bred for super-intelligence. Gallup must be evacuated, and the mayor is told to broadcast a warning to all residents to stay indoors and secure their houses. Unfortunately, no one listens. The bats invade the town and, within minutes, people are grabbing guns and shooting at anything that moves, cars are being smashed up and bursting into flames, and victims lay in the street dying. Tobe Hodge is one of them.

More help is required. The military arrives and begins evacuating the town. They give Sheila and her bat hunters 48 hours before they start blowing things up. Sheila sets up headquarters in the most easily secured building in Gallup--the school. The military has promised to center the infrared cameras of a Chromo-B340 satellite on the area around Gallop to help locate the bat roost. Even when the roost is located, however, how are they going to annihilate every last bat? From the numbers they saw the other night, there are thousands of them. Bombing the roost will only scatter them, Sheila explains, leading to the creation of other roosts and potentiating the problem. Poisoning them is not an option, as the most popular bat poison (chlorofoccinol?) is only marginally effective against bats but highly lethal to humans. Sheila thinks the best solution is to put them to sleep by lowering the temperature in the cave. At 40 degrees F, bats begin to hibernate. At 32 degrees, they freeze to death.

Jimmy arranges for an NGIC Industrial Coolant that uses freon, carbon dioxide, and oxygen to be dropped off as soon as the roost is located. When the spy satellite begins sending pictures of the bats, Emmett recognizes the area as that of the old Black Rock mine. Everything is set to begin at 0600 hours. Except that the government has other ideas, which don't include waiting until dawn. During the night, they wire the mine with explosives. Unfortunately, the bats kill them all then come for McCabe, their creator, who still has a modicum of mind control over them. The bats want their freedom. When Sheila et al arrive at the mine the next morning, they are informed by the military that they weren't able to turn on the coolant unit, so the plan now is to bomb and gas the mine starting in one hour.

Sheila decides that one hour is enough time for them to get the coolant unit started, so she and Emmett suit up and enter the mine. Jimmy stays outside to monitor their progress and to blow up the mine entrance should it become necessary. Although they find themselves up to their waist in bat guano, they are successful at starting the coolant. As they make for the exit, the bats begin to pursue. Run, run, run! The moment they exit, Jimmy detonates the explosives. As they drive away, an escaped bat lifts its head out of the sand on the road. The car runs it over. Splat. [Original Synopsis by bj_kuehl]