The inmates of an insane asylum take over the institution, imprison the doctors and staff, then put into action their own ideas of how the place should be run.

A mysterious man is sent deep into the forest to investigate the bizarre behavior of the notorious Dr. Tarr. What he stumbles upon is the doctor's torture dungeon, a hellish asylum completely cut off from civilization and presided over by the ultimate madman. Innocent people have been savagely chained, tortured, and stuck in glass cages, then forced to take part in gruesome games of ritual slaughter.—Anonymous