Two family clans have always been enemies; they spend their time hating and killing each other. The daughter of the Campos family and the son of the Mounter family fall in love, thus causing further hatred and deaths.

A cop chases two hippies suspected of a series of Manson family-like murders; unbeknown to him, the real culprits are the living dead, brought to life with a thirst for human flesh after government officials conduct pest control experiments using subsonic waves in the area.

After several coeds are murdered at a college, a professor (Fabio Testi) who is involved with a student becomes a suspect, along with several other male and female teachers.