An elderly man, barely breathing after being bitten by a strange plant, is brought to the hospital. While the doctors were trying to figure out what had happened, a worm crawled out of the already dead man and began to grow at an alarming rate. Meanwhile, the authorities declared the hospital a contaminated zone and ordered the military to place it under quarantine. Everyone in the hospital found themselves cut off from the world and locked in with the worm, which had already transformed into a huge, bloodthirsty insect. Police officer Jim Bishop, doctor Rachel Carson, and scientist Elliott Jacobs will face off against the monster.