La serie racconta le vicende del dottor Alec Holland che, a seguito di un contatto fortuito con una sostanza chimica, si trasforma in un essere mostruoso e si rifugia in una zona paludosa della Louisiana.

Swamp Thing: The Series, is a science fiction, action/adventure television series based on the DC Comics character Swamp Thing. It debuted on USA Network on July 27, 1990 and lasted three seasons for a total of 72 episodes. It was later shown in reruns on the Sci Fi Channel.