Elliot Wade (Sam Bottoms) obtains ownership of the Dolly Dearest factory in Mexico. Not far from the factory is the underground Mayan tomb of Sanzia, or Satan on Earth. An archaeologist breaks into the sarcophagus but is crushed by the stone slab that covers the entrance, releasing the malevolent spirit of Sanzia. Upon its escape, Sanzia takes refuge in the porcelain doll, Dolly Dearest.