This series only ran for 5 episodes (including a pilot) but spawned a successful line of figurines based on Swamp Thing and the Un-Men, and a video game for the NES and Gameboy. As in the films, Arcane is responsible for Alec Holland’s transformation into Swamp Thing and Abby is his stepdaughter.

Cast:
Len Carlson as the voice of Swamp Thing
Don Francks as the voice of Dr. Anton Arcane
Tabitha St. Germain as the voice of Abby

Summary:
Swamp Thing protects the swamp from Arcane and his gang of genetic mutants, the Un-Men.

Release:

Swamp Thing : Guardian Of The Earth DVD (88 min.), UAVCO, 2004. Region 1, NTSC (USA/CA). Collects all 5 episodes. Now out of print.

Swamp Thing : Guardian Of The Earth DVD (88 min.), Anchor Bay, 2008. Region 2, PAL. Collects all 5 episodes. EAN: 5060020700095

Bibliographic References:
Howe, Andrew. “Green Warrior: Swamp Things and the Environmentally Turbulent 1980s.” Americana: The Journal of American Popular Culture (1900-Present), vol. 23, no. 1, Spring 2024, https://americanpopularculture.com/journal/articles/spring_2024/howe.htm.
This article examines the environmental themes that are explored in Swamp Thing-related media (comics, film, and television) between 1982-1993 and relates these topics to contemporary environmental concerns (such as fear of chemical pollution and nuclear waste). The article points out some of the environmental threats raised during the series, and explains the real-life events that may have inspired them.

Further Links:
IMDb – full cast and production details.
CultTVman’s Swamp Thing Page focuses mostly on the live-action series, but provides a bit of information about the cartoon, and images of the related line of toys.