In a forest on a remote island, a team of loggers led by Mac (Julian Christopher) face opposition from protesters led by Rita, a known eco-terrorist. The company that employs Mac's team is conducting an experiment in the area, supervised by Carter, a chemist. One of Mac's loggers hits a tree spiking tree and suffers a wound from his chainsaw. The sap of the tree infects his wounds and causes him to undergo a transformation.