A couple inherit an estate that has been long since abandoned. It exists on the shores of Dead Lake where locals claim there lives a horrible creature with an appetite for all manner of living beast. Visiting the estate they find a squatter inhabiting the place. He is a scientist conducting exotic and frightening genetic experiments. The castle is filled with his horrific creatures and the couple, with the help of some locals, attempt to rid the place of the most horrific of all… the GIANT LEECH!!! A fun episode that would have scared the pants off me as a child. In the vein of The Fly.