A British woman visits her husband at the Mexican mine he is attempting to reopen and discovers that the workers refuse to enter the mine fearing an ancient curse. The couple enter the mine to prove there is no danger and inadvertently release a demon which possess people’s left hands and forces them to behave in a suitably diabolical manner. The only way for a possessed person to free themselves from this torment is to cut off their left hand after which it scurries away in search of its next victim.
Corporate smuggling of South American killer bees into the United States results in huge swarms terrorizing the northern hemisphere. A small team of scientists work desperately to destroy the threat, but the bees soon mutate into a super-intelligent species that threatens the world.