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.