Convicts on a chain gang sniff formaldehyde fumes to get high. They attempt a prison break and are shot down by the guards. After being buried, they rise from the dead, killing all in their path with shovels and hoes.

Marland Proctor
as Paul Johnson

Susan Charney
as Carol Johnson

John Dennis
as Jablonski

Philip Kenneally
as Warden

Duncan McLeod
as Dr. Saunders

Virgil Frye
as Braddock

Tony Vorno
as Mitchell

Phil Hoover
as Donovan

Erik Stern
as Coler

Carmen Filpi
as Nolan
CinemaSerf
So a bunch of convicts on a chain gang snort some industrial scale formaldehyde before attempting a mass escape from their incarceration. They are all shot by their diligent guards and hastily buried. That it? Of course not, they all rise again and determine to avenge themselves on humanity. Perhaps...