Two bat experts and a local sheriff try to stop thousands of bats who've become killing machines due to a scientific experiment gone awry. With Lou Diamond Phillips, Dina Meyer, León, Carlos Jacott, Bob Gunton and James Sie. [1:30]

SEX/NUDITY 1 - A brief kiss.

VIOLENCE/GORE 6 - Lots of people are attacked and killed by bats, but the camera moves around so quickly that the scenes are usually very blurry; in some scenes, though, we hear people screaming and see them flailing as they're attacked. After a bat attack, a lifeless body crashes through a car's windshield and lands facedown (we see blood on the corpse's shirt); also, we see hundreds of bats cover a man, presumably killing him. Bats cover a car and try to attack two people who are sitting in it. Several times bats swarm around people and chase them and a bat knocks a bicycle-rider to the ground. Two people fall through the floor of a mineshaft and land in a river of bat excrement. A man pushes another against a wall and then punches him. Twice, a man runs through a window. In several scenes bats are shot, electrocuted or firebombed; a few times we see bats explode or see bloody bat-parts. We see one extremely bloody, bitten corpse that no longer has any flesh covering its torso (we see its fake-looking stomach and other internal organs); we hear squishy sounds as someone prods around the corpse's stomach with a metal tool. We see many corpses with bloody bites and scratches on their faces, necks and bodies, plus some blood on their clothing. We see people with bloody cuts and bandages on their faces and arms. We briefly see some photographs of bloody animal corpses. We see several explosions, some fires, and a car crash. We see several close-ups of snarling bats with large teeth. One instance of threatening with a gun.

LANGUAGE 5 - 1 F-word, several anatomical references, lots of scatological references, lots of mild obscenities and some insults.

DISCUSSION TOPICS - Bats, scientific experiments.

MESSAGE - Don't tamper with nature.