A young European boy living in San Francisco is reluctant to marry his long-term girlfriend because he wants to travel around the world first. His wealthy uncle agrees to send him on a global expedition aboard his ship, but en route the boy and his travelling companion are shipwrecked on a remote island, populated by countless prehistoric creatures as well as gold-hunting bandits.

An experimental submarine with a very experienced crew, the "Siren II" is sent to find out what happened to the "Siren I" after it mysteriously disappeared in a submarine rift. Things go awry when they begin to find things that shouldn't be there...

Paul, a mercenary in Africa, decides that he can no longer work for the Organization because of their brutal tactics. But the evil Organization refused to release him, and Paul finds that he must fight his way out.

After a drug deal gone wrong, a group of punks flee to a secluded mansion where the house itself begins to terrorize and kill the trespassers.

1979 film by Juan Piquer Simón