Iconoclastic, take-no-prisoners cop John McClane, finds himself for the first time on foreign soil after traveling to Moscow to help his wayward son Jack - unaware that Jack is really a highly-trained CIA operative out to stop a nuclear weapons heist. With the Russian underworld in pursuit, and battling a countdown to war, the two McClanes discover that their opposing methods make them unstoppable heroes.
The Russians seek help in dealing with the Mafia from the veterans of the Police Academy. They head off to Moscow, in order to find evidence against Konstantin Konali, who marketed a computer game that everyone in the world is playing.
In WWII Western Germany, Private David Manning reluctantly leaves behind a mortally wounded fellow soldier and searches for survivors from his platoon, only to learn from commanding officer Captain Pritchett that they have all been killed in action. Despite requesting a discharge on the grounds of mental disability, Manning is promoted to sergeant and assigned to lead a new platoon of young inductees.
