In September 1985, the United States conducts a televised test of "Space Ranger"—a crewed
missile defense space weapon consisting of four laser-equipped modules and a
mother ship named
Voyager—at
Vandenberg Air Force Base, overseen by American researchers Burt Gains and Professor Brown. Gains believes Space Ranger could end nuclear war forever, but also fears it could worsen the
nuclear arms race. The next day, he is kidnapped by Soviet spies who attempt to smuggle him back to the
Soviet Union in an
Alfa-class submarine for information on Space Ranger. U.S. President Gibson orders the submarine sunk to secure Space Ranger's secrets, and a
P-3 Orion destroys it with a
nuclear torpedo, killing everyone aboard, including Gains. The sinking inflames tensions between the U.S. and the Soviet Union; as Gibson seeks a peaceful resolution, Soviet
Premier Orlov is offered a choice between a reasoned response by
First Deputy Premier Kutsov and military retaliation by hawkish
Minister of Defence Bugarin, but opts to simply place the
Soviet Armed Forces on high alert. In the weeks after Gains' death, his close friend and fellow researcher, Japanese national Wataru Mikumo, is promoted to replace him as head of the Space Ranger project, and Wataru bonds with Gains' sister Laura. Meanwhile in Neinberg,
West Germany, farm girl Marina and her boyfriend,
British Army missile crewman Michael, prepare for the town's upcoming New Year celebrations, while off the coast of
Hokkaido, the
Japan Air Self-Defense Force intercepts a Soviet
Tu-22. On New Year's Eve, elite
Soviet Air Forces pilot Boris Sorenkuga, flying the experimental Su-28 Black Dragon bomber, defects to the West and lands at a
West German Air Force base near Neinberg. Fearing the loss of the Black Dragon's advanced technology to NATO, Orlov reluctantly allows Bugarin to authorize a
Spetsnaz assault on the air base, but promptly has a heart attack. Though the Spetsnaz unit kills Sorenkuga and destroys the Black Dragon, Soviet forces cross the
Inner German border to support them, sparking direct conflict between NATO and the Soviets. Gibson rejects a suggestion by the
Supreme Allied Commander Europe to launch a
first strike and tries to communicate with Orlov to no avail. The battle destroys Neinberg, killing several civilians including Marina; a vengeful Michael steals a
missile carrier and launches its
tactical nuclear missile against Soviet forces at the border, killing them but fatally
poisoning him with radiation. Wataru and Laura learn of the war while visiting Tokyo for the New Year, and Wataru rushes back to Vandenberg, leaving Laura despondent in an underground bar. The fighting rapidly escalates and spills out of Europe as additional
theaters open in the Middle East, Central America, and the Pacific. China initially allies with the Soviets to invade much of East Asia, but racial tensions and disputes over occupied territory eventually lead China to attack the
Russian Far East. Gibson receives a
ceasefire proposal from Orlov, but rejects its demands for massive territorial gains;
Secretary of State Girard theorizes Orlov himself may not have sent it. Meanwhile in Moscow, Kutsov convenes the
Politburo to remove Bugarin and draft a proper ceasefire, but Bugarin arrives and launches a coup d'état, ordering Kutsov and the entire Politburo arrested for "treason". Bugarin orders a
Soviet Navy ballistic missile submarine to strike the
East Coast with
ICBMs; the submarine's captain refuses, but the executive officer kills him and orders the launch. Gibson has a breakdown after ordering retaliatory strikes against Soviet cities and is reassured of his actions by Girard. Bugarin is confronted by Orlov, revealed to have survived the heart attack, who condemns his warmongering actions, but one of Bugarin's aides assassinates him before he can reach Gibson through the
Moscow–Washington hotline. The nuclear exchange devastates Washington, D.C., New York City, Chicago, Miami, Paris, Tokyo, and dozens of cities across the world, killing millions; despite the destruction, society remains intact and the war continues. Gibson, forced underground with the rest of the U.S. government, learns Vandenberg is still operational and orders the immediate launch of Space Ranger. Laura, having survived the destruction of Tokyo by staying in the bar (now a makeshift shelter), traverses the ruined city to find a way back to Vandenberg, where she plans to be with Wataru as the world ends. The fighting begins to slow as the
anti-war movement swells: civilians in the once-fractured Middle East march through battlefields demanding peace; the Pope delivers a stirring speech against the war; and disillusioned soldiers on both sides begin deserting en masse. Space Ranger is launched in time to counter another wave of Soviet ICBMs, but three laser modules are overwhelmed and destroyed, the fourth is crippled, and the
Voyager is severely damaged, leaving Wataru as the last surviving crew member. In Moscow, Kutsov is released and confronts Bugarin, who reveals he plans to fire a final volley of
MIRV-loaded ICBMs at the last standing cities in the U.S., crushing all remaining opposition and allowing Soviet communism to reign uncontested. Realizing he has gone mad, Kutsov and Bugarin's former supporters attempt to stop him, but Bugarin manages to launch the ICBMs before being shot and killed. Laura arrives at Vandenberg, and Professor Brown allows her to board a shuttle sent to rendezvous with Wataru. In space, Wataru repairs the fourth module and, assisted by the crewed Soviet satellite
Baikal, manages to shoot down most of the MIRVs except one bound for Los Angeles. Unable to get a clear shot, Wataru flies the
Voyager extremely close to the MIRV, destroying it but knocking him unconscious and throwing him into space. Gibson and Kutsov dispatch the American shuttle and
Baikal to retrieve Wataru. As the spacecraft close in, Wataru regains consciousness to see the Sun rise from behind the battered Earth, its inhabitants now set on
world peace. ==Cast==