The US military is running a test for a special type of radio transmitter, to be used to communicate with submarines, in a deep system of underground caves in Central America. When the signal from one of the transmitters suddenly disappears, a team of soldiers led by Major Elbert Stevens and cave specialists led by Rupert 'Wolf' Wolfsen including scientist Leslie Peterson are sent in to find out what happened. Exploring deep underground, they stumble upon a tribe of albino cave-dwellers who have apparently been isolated from the rest of the world for thousands of years. The cave-dwellers are hurt by radio frequencies and are able to see in infra-red frequencies, tracking the explorers by their body heat.

Raymond Avila is an ex-gang member trying to build a future. His kid brother Chuco is a sullen low-rider still caught up in the life. Despite their differences, their family bond is strong. But that bond is violently tested when rivals challenge Chuco's gang and ignite a neighborhood war.

Jake, an ex-Motocross champion, is set up for a crime he has not committed. He now finds himself running from the government, and must find the man who set him up and to clean his name.

After he retires from the police force, a veteran cop is framed for robbery but his friends, a rookie and three ex-cops, come to his rescue.

A man is imprisoned for a crime he didn't commit. When his wife is murdered and his son kidnapped and taken to Mexico, he devises an elaborate and dangerous plan to rescue his son and avenge the murder.

A villainous carnival owner traps a young werewolf to include in his growing menagerie of inhuman exhibits.