The second series of comics was produced to take advantage of the 1982 Swamp Thing movie by Wes Craven. The comics were only marginally successful until Alan Moore took over as writer. Moore took the character in a new direction, starting with issue #21. For several years running, Swamp Thing was widely considered the best comic books had to offer and won many awards.
There have been two movies, an animated mini series, and four comic book runs. Here are my takes on the character.
Wizard Cover Art, November 1992
Paper Sculpture, March 1995
Girl from the Green (based on a Swamp Thing character), December 1997
Swamp Thinker paper sculpture, February 2004