Don't let the varying covers of this movie trick you into thinking that there is some interesting viewing ahead, as I can assure you there is nothing remotely interesting about this mess.
Movie starts with some kind of prologue that occurred 17 years ago. A young girl running from something in the swamp, runs into a man who turns out to be a deranged killer. The then local sheriff and some men track him down and instead of bringing him to justice they beat him within an inch of his life and then throw him in the bog.
Flash forward to "today", and there is another young girl, albeit sightly older & more developed, running through the swamp who then gets dragged to her death and is found floating up in the marshes. The townspeople all suspect the former sheriff, who's now an old man so they set about bringing him to justice.
Enter the old man's estranged daughter; lured back to the town under the false pretence that he was dying. Once back into town the story of him being a suspected murderer is revealed and she's there in the hope to help catch him.
Long story short, the man who tricked the daughter to come back to town turns out to be the creature responsible and after a few ridiculous deaths and seemingly endless chases through the same part of swampland, father and daughter reconcile, creature killed and everybody lives happily ever after. The reason all this happened is that the swamp devil has been hunting down all those who "wronged" him and making their deaths look like accidents or suicides, plus by his own admission he just loves killing.
The worst thing about this is not the cheap CGI, the boring deaths, the highly derivative story or the poor acting, what really got under my skin is that the identity of the killer/creature is actually given away within the first 5 minutes and then repeatedly throughout the movie. For some stupid reason the killer thrown into the bog 17 years ago simply didn't die, he instead bonded with the bog itself and became the swamp devil. Sure why not. That wouldn't be so bad except that he can somehow change from being human to vine creature at will, yet he leaves inexplicable muddy footprints wherever he seems to go and no one takes any notice. In addition he seems to be bound by the city limits, never being able to cross the county boundary line. Let's not forget the constant attempts at shooting at this thing which never works, (it is largely a plant after all) but they keep trying and of course failing and you wonder why they don't try fire, it is as I said largely a plant.
So how did they manage to kill this thing? They drive to the edge of town with the creature on the back of a pick-up truck where it jumps off just before they cross the line. It then stood around like an idiot knowing that certain death was a mere 2 feet away until the old man in a car ploughed into it and threw it across the county line where it exploded in an shower of dirt, roots and vines.
And like all cheap and nasty monster movies, going all the way back to the 50's, there is some kind of epilogue where the woman who owns the diner goes into the swamp and then lovingly caresses a skeletal hand shaped vine coming up out of the bog indicating that the "horror is due for a return". All I can say is, I certainly hope not!