Fact1: team of loggers led by Mac face In forest on remote island opposition from protesters led by Rita, Fact2: company is conducting experiment in area supervised by Carter, Fact3: Mac Rita and Carter have taken shelter along with other survivors including Mac 's Luke bunker, Fact4: Tyler 's father is overruled by other members of board, Fact5: group decides to travel to abandoned facility in hopes of radioing for help
Output: 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 ecoterrorist. The company that employs Macs team is conducting an experiment in the area, supervised by Carter, a chemist. One of Macs loggers hits a spiked tree and suffers a wound from his chainsaw. The sap of the tree infects his wounds and causes him to undergo a transformation. The president of the company decides to send his son Tyler to investigate the loss of contact with the loggers, hoping Tyler will learn more about the industry. When he arrives, Tyler discovers most of the loggers and protesters have become zombies. He comes across a bunker where Mac, Rita and Carter have taken shelter, along with other survivors including Macs apprentice Luke Michael Teigen. The company learns of the zombie outbreak when a chemist examining one of Carters samples at their lab is infected by the altered sap. Tylers father wishes to send an evacuation to rescue his son but is overruled by the other members of the board, who decide to set up a quarantine. The survivors leave the bunker and attempt to drive off the island, but they find the road blocked by the company. They get separated and several more victims fall to the zombies. After reuniting at the logging base, Mac recovers another truck and the group decides to travel to another abandoned facility in the hopes of radioing for help. At the camp, Mac finds the radio dead, while Tyler and Rita begin to become close. Luke is dragged off by the zombies when Carter becomes too frightened to help him. Later, Carter becomes overwhelmed by guilt and confesses that the company had him conducting genetic experiments to grow the trees faster, leading to an increase in profit. The next day, the remaining survivors attempt to drive to another potential exit but encounter more zombies. Mac loses hope when he sees Luke as a zombie, as he considered Luke a son, but Rita tries to console him. They find the road blocked but hear a chopper approaching. Instead of saving them, however, the chopper opens fire. They are rescued by another renegade band of surviving loggers, who reveal that the company plans to kill them all. The militaristic nature of the camp disturbs the remaining survivors, especially a sadistic game they play in which a selected member of the camp must kill a certain number of zombies in a pen. That night, the head of the camp attempts to rape Rita, but Tyler defends her. They admit their attraction and have sex. The next day, Carter is selected to enter the pen, but he becomes frightened and jams his gun, ending up needing to be rescued. He is bullied mercilessly for this by the loggers, who blame him for the crisis. His spirit broken, Carter takes an axe and leaves the camp alone that night. Zombies wander in through the open gate and kill everyone except Mac, Rita and Tyler, who wake up and flee. At the gate, Mac is bitten. Rita confesses to him as he turns that she was the one who spiked the tree, and with his last breaths as a human, Mac forgives her. While running through the woods, Tyler and Rita hear Carter, who is surrounded by zombies, screaming for help. Tyler attempts to save him, but they are both overrun by zombies. Rita, now the last survivor, sees the lights of a car and happens upon a road she begins to follow in hopes of escape. In his mansion, Tylers father looks sadly at a picture of himself with Tyler, realizing that his actions led to the loss of his son.