Swamp Thing is a 1982 horror film directed by
Wes Craven, based on the DC comics character.
During a hostile attack on a research center, scientist Alec Holland is dosed with his bio-restorative formula and is turned into the eponymous being when he runs into the swamp while on fire.
In 1989 it was followed by a
campy sequel
The Return of Swamp Thing.
First film has:
The Return has the additional examples: