Carl Kolchak(Darren McGavin) investigates two seemingly unrelated murders that turn out to have a common thread involving Spanish moss, which was found on the bodies. They are traced to a dream research project where the subject is a comatose Cajun man who is being deprived of the ability to sleep, and as an unintended consequence, his unconscious mind has somehow materialized a childhood legend of a towering swamp monster called the Peremalfait(played by Richard Kiel), who kills anyone it views as a threat, and whose next target is Carl... Keenan Wynn makes the first of two appearances as police captain Joe "Mad Dog" Siska, who can't stand Carl! Memorable episode overcomes far-fetched premise with a scary,unique monster and eerie atmosphere.