It might feel cheesy now, but its still fun to me after all these years.
Swamp Thing was directed by Wes Craven and a few of his movies have made it onto these lists in the past. I wouldn't say this is Craven's best work but it's not bad and it's entertaining. Plus it has Carnivale's Adrienne Barbeau in it.
The plot revolves around Dr. Anton Arcane who survived an incident with a special chemical, but now he is not a man anymore but a swamp plant monster!
In my opinion there is a lot of similarities in this film that are also in other monster movies, such as King Kong and Creature from the Black Lagoon. Those two movies I enjoyed more but Swamp Thing has its own kind of charm.
After the original movie the series continued in a sequel, then a live action TV series and then an animated TV series. So, Swamp Thing continued living long after 1982.
If you haven't checked out Swamp Thing yet, you should. It's a fun movie.