Directed by John Hayes
Starring Philip Kenneally, Duncan McLeod, John Dennis

Convicts on a chain gang sniff expermental formaldehyde fumes to get high. They attempt a prison break and are shot down by the guards. Buried in the prison garden, they rise from the dead, killing all in their path with shovels and hoes who get in their way for their quest to get high once more off the formaldehyde.