Honeymooning in Bavaria, the young couple become stranded and are forced to stay the night in the area. Doctor Ravna, owner of the impressive chateau that sits imposingly above the village, invites them to dinner that evening. Their association with Ravna and his charming, beautiful family is to prove disastrous as they become unwittingly embroiled with this family of vampires who seek to initiate them into their diabolical creed.
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 (Bottoms) and cave specialists led by Rupert ‘Wolf’ Wolfsen (Powell) including scientist Leslie Peterson (Blount) 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.
A gang of young people call themselves the Living Dead. They terrorize the population from their small town. After an agreement with the devil, if they kill themselves firmly believing in it, they will survive and gain eternal life. Following their leader, they commit suicide one after the other, but things don’t necessarily turn out as expected…