Teenage science genius Paul (Christopher Collet) realises the lab of Dr. Mathewson (John Lithgow), his mother's new boyfriend, isn't really developing lasers. It's building nuclear bombs. To expose the lab's secret mission, Paul and his girlfriend Jenny (Cynthia Nixon) steal some plutonium, build a bomb and enter it in a science fair. But the military learns of Paul's plans and pursues him with lethal force. Now, as time is running out, only Dr. Mathewson can save Paul... and stop the unthinkable from occurring!