In the deep recesses of a primal swamp, scientist Holland (Wise) works on a formula for an animal-plant biosynthesis.

But when evil villain Louis Jourdan attempts to steal Holland's test serum, the good doc is accidently transformed into a plant-like superhero who endlessly saves Federal agent Cable (Barbeau) from the malevolent Jourdan.

Often a mixed bag, the true strength of Swamp lies in its ability to mingle comic and serious tones with equal measure.

Tough as nails damsel-in-distress Barbeau is terrific (as usual) and proves comfortable in both action and horror setups.

Meanwhile, William Munns' make-up effects for the Thing accomplish the job, simplistically and endearingly.

Alternative cable versions feature slightly different score compositions in select scenes.