A man pricks his finger while tending to an exotic plant and is rushed to the ER, where he is diagnosed with a bacterial infection before a worm-like parasite emerges from his mouth. As the infection spreads throughout the ER, the parasite is exposed to a genetic growth stimulant, which causes it grow to monstrous proportions and terrorize the hospital.

• Mithras
• Steve Railsback
• Gwynyth Walsh
• John Vernon
• Joe Flaherty
• Robin Duke
• Susan Anspach
• Don Lake
• Helen Hughes