While working in a greenhouse, a man receives an insect bite after touching an exotic plant. Immediately, he falls ill and is taken to an emergency room where the doctors diagnose him as suffering from an unknown bacteria, and a strange parasite which emerges from his mouth as a large slimy wormlike creature. Soon, there are more cases of bacterial infection, but the more immediate problem for the hospital is the wormlike creature which after accidental exposure to a genetic growth stimulant grows to monstrous proportions and starts a reign of terror and bloodshed in the hospitals abandoned wing.
While visiting Switzerland, an American college professor, Adam, keeps running into a divorced British secretary, Patricia, wherever they go. First their cars collide. Then they smash into one another on a ski slope, each breaking a leg. In between numerous quarrels, the two develop lust and love. They hastily marry, but the disagreements continue. Patricia decides to leave, so Adam decides to fake a suicide. They lose and find each other, again and again.
