A scientist creates a diamond that can focus sun-rays to burn through anything. The villain, in a bid to get the diamond, kills the scientist. The scientist's karate-learning sons, Desh and Vijay, are separated from each other and their mother. Vjay grows up with his karate instructor while Desh is reared by a gypsy camp.
High School student David Lightman (Matthew Broderick) has a talent for hacking. But while trying to hack into a computer system to play unreleased video games, he unwittingly taps into the Defense Department's war computer and initiates a confrontation of global proportions! Together with his girlfriend (Ally Sheedy) and a wizardly computer genius (John Wood), David must race against time to outwit his opponent.
The film portrays a fictional nuclear war between NATO forces and the Warsaw Pact that rapidly escalates into a full scale exchange between the United States and the Soviet Union, focusing on the residents of Lawrence, Kansas, and Kansas City, Missouri, as well as several family farms situated next to nearby nuclear missile silos.
The story of Karen Silkwood, a metallurgy worker at a plutonium processing plant who was purposefully contaminated, psychologically tortured and possibly murdered to prevent her from exposing blatant worker safety violations at the plant.