Jorge Grau's infamous zombie film is actually a surprisingly early entry into the eco-horror craze - for "mad cadavers", read "mad cows".
An experimental pest-control machine has the unfortunate side effect of reanimating corpses, most of which look like the Joy Of Sex man and clearly date the film. There is, however, a great use of English countryside locations and one or two authentic chills, helped enormously by the great DVD sound mix.