A young inventor obsessively attempts to engineer the perfect romantic weekend and record every happy moment between him and his girlfriend, Lana. When his idea is thwarted by the unexpected arrival of his partner's aggressive ex-boyfriend, the technical wiz invents a time-travelling device to return to the exact moment the incident occurred to prevent it from happening. As a result, the three characters become trapped in an infinite metaphysical time loop.

It's 2274, and on the surface, it all seems to be an idyllic society. Living in a city within an enclosed dome, there is little or no work for humans to perform, and inhabitants are free to pursue all of the pleasures of life. There is one catch however: your life is limited and when you reach thirty, it is terminated in a quasi-religious ceremony known as "carrousel". Some, known as "runners", try to escape their fate when the time comes, and it's the job of Sandmen to track them down and kill them. Logan (Michael York) is such a man, and with several years before his own termination date, thinks nothing of the job he does. Soon after meeting a young woman, Jessica-6 (Jenny Agutter), he is ordered to become a runner and infiltrate a community outside the dome known as "Sanctuary" and to destroy it. Pursued by his friend Francis (Richard Jordan), also a Sandman, Logan and Jessica find their way to the outside. There, they discover a beautiful, virtually uninhabited world. Logan realizes that he must return to the dome to tell them what he's found and be set free.

A rare atmospheric phenomenon allows a New York City firefighter to communicate with his son 30 years in the future via HAM radio. The son uses this opportunity to warn the father of his impending death in a warehouse fire, and manages to save his life. However, what he does not realize is that changing history has triggered a new set of tragic events, including the murder of his mother. The two men must now work together, 30 years apart, to find the murderer before he strikes so that they can change history--again.

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