The young son of an American diplomat and his wife, living in London, turns out to be marked with the sign of Satan, the infamous "666". It soon becomes apparent that he could be the Anti-Christ incarnate and possesses the evil powers to stop anyone who stands in his way.

Police shoot and kill a convicted strangler after cornering him in a toy store. As the man is dying, he transfers his soul into a doll.

Inspired by the classic Edgar Allan Poe story "The Tell-Tale Heart," the contemporized adaptation sees Lucas starring as a single father whose recently transplanted heart leads him on a frantic search to find the donor's killer before a similar fate befalls him.

A tremor under the surface of Lake Victoria unleashes scores of prehistoric piranhas, an event which rallies the local sheriff (Shue) who will risk everything to save her townsfolk.