Harry Washello and Julie Peters meet at the
La Brea Tar Pits and immediately fall in love. They spend the afternoon together and arrange to meet again at midnight. However, due to a freak accident, a power failure results in Harry's alarm not going off until much later. Julie cannot reach Harry, so she leaves for home. When Harry awakes that night, he realizes what has happened and rushes to Julie's workplace, arriving at 4 a.m. Harry tries calling Julie on a payphone but only reaches her answering machine, where he leaves an apology. The phone rings again and Harry answers, hearing a frantic man named Chip urgently warning that
nuclear war will break out in less than 70 minutes. When Harry asks who is calling, Chip realizes he has dialed the wrong
area code. He pleads with Harry to call his father and apologize for some past wrong before he is interrupted and presumably shot dead. An unfamiliar voice picks up the phone and tells Harry to forget everything he heard before disconnecting. Harry, confused and not entirely convinced of the authenticity of the information, wanders back into the diner and tells the other customers what he has heard. As the patrons scoff at his story, one of them, a businesswoman named Landa places calls to politicians in
Washington and finds that they are all suddenly heading for "the extreme
Southern Hemisphere". She verifies that the launch codes Chip mentioned are real and, convinced of the danger, immediately charters private jets out of
Los Angeles International Airport to a compound in a region in
Antarctica with no rainfall. Most customers and staff leave with her in the owner's delivery van. When the owner refuses to make any stops, Harry, unwilling to leave without Julie, arranges to meet the group at the airport and jumps from the truck. Harry is helped and hindered by various strangers, who are initially unaware of the impending apocalypse. In the process, he inadvertently causes several deaths, which leaves him deeply shaken. When he finds Julie and tells her what is happening, she notes that there has been no confirmation of the attack. Desperate to reach the airport and not having a car, Harry finds a helicopter pilot and tells him to meet them on the roof of the
Mutual Benefit Life Building, where Landa orders a helicopter and a large amount of supplies to be delivered. Julie has also tried to find a pilot on her own, and in the moments it takes to find her, Los Angeles descends into violent chaos. There is still no confirmation any of this is real, and Harry wonders if he has sparked a massive false panic in the example of
Chicken Little. However, when he uses a phone booth to contact Chip's father, he reaches a man who says his son is a soldier. Harry tries to pass on the message he was given, but the man hangs up before Harry finishes. When they reach the top of the Mutual Benefit building they find the pad empty, with only Landa's drunk co-worker on the roof. Any doubts about a false alarm are eliminated when a missile can be seen streaking across the sky. As they fear the end, the helicopter suddenly returns with the pilot badly wounded but fulfilling his promise to come back for them. After they lift off from the roof, several warheads hit and the nuclear
E.M.P. from the detonations causes the helicopter to crash into the La Brea Tar Pits. As the helicopter sinks and the cabin fills with natural asphalt tar, Harry tries to comfort a hysterical Julie by saying someday their fossils will be found and they will probably be put in a museum, or that they might take a direct hit and be turned into diamonds. Julie, accepting her fate, calms down and takes comfort in Harry's words, and the movie fades out as the tar fills the compartment. A final explosion seems to imply a direct hit has taken place. ==Cast==