The Rotten Tomatoes website says it is a sequel to the movie "Unseen Evil", w/e that is. It seems to me like a cheesy aliens ripoff. The creature effects and acting pale in comparison to the '86 classic, according to most reviewers, and the plot revolves around a woman locked up in an insane asylum being the only one who knows the mystery of the alien menace in the forest.
~For centuries, human beings have worshipped these beasts as gods, beasts that will forever haunt us, beasts waging an eternal war.....~
http://www.freewebs.com/shanezilla