Garden of the Dead is the twisted tale of convicts turned living dead. While working on the chain gain, a group of bored inmates decide to get high by sniffing a new experimental form of formaldehyde. While under the influence of this strange chemical, the inmates go crazy in an attempt to overthrow the guards and make their break for freedom. The prison guards put down the uprising by shooting the high prisoners and burying them in the prison garden. Later that night the dead chain gang prisoners begin to rise from their graves and unleash havoc on the prisoners and guards.