Villain(s)  Invisible monster

Actor(s):  James Philbrook, Arturo Fernández, Soledad Miranda, José Bódalo

Brief Description  Sound of Horror (originally titled El sonido de la muerte or El sonido prehistórico) is a 1964 black-and-white Spanish B-horror film directed by José Antonio Nieves Conde. It features an unusual premise: an expedition in remote Greek mountains unearths a prehistoric, invisible monster that attacks with a piercing, unearthly shriek.

Plot:
Dr. Pete Asilov and a group of explorers travel to a remote, mountainous region of Greece. While they claim to be doing scientific research, they are secretly hunting for hidden World War II gold treasure. Using dynamite to blast open a cave wall, the group uncovers a petrified or stone-like prehistoric egg and accidentally awakens a hidden creature. The hatched creature is entirely invisible, but gives away its presence through a bloodcurdling, bird-like shriek. It begins brutally slashing and killing members of the expedition, starting with Stravos and the housekeeper Calliope. Trapped and terrified, the survivors retreat into a nearby house, barricading themselves as the invisible predator stalks the grounds outside.

After their initial attempts to escape fail and their vehicle is trapped, Mr. Dorman sacrifices himself by setting fire to their reserve fuel supply, destroying the invisible beast along with himself while the remaining survivors walk back to the village. Because the production had a minuscule budget, the decision to make the monster completely invisible saved on special effects costs, relying entirely on sound design and audience imagination. The film is primarily remembered today as the big-screen debut of Ingrid Pitt (who later starred in Hammer horror classics like The Vampire Lovers) and an early showcase for Soledad Miranda.