A scientist working on an energy project discovers his family have undergone strange changes in their personalities, while a series of natural disasters are happening across the globe. He realises that his work has accidentally pushed the planet forward in time seven seconds - and the loss of those few moments has had devastating effects on the world and the human race.

After a Soviet space station crashes into a New York City subway tunnel, a species of venomous spiders is discovered, and soon they mutate to gigantic proportions and wreak havoc on the city.