In ferner Zukunft: Der menschlichen Kolonie auf dem Planeten Janus droht der Untergang. Eine verheerende Katastrophe macht eine sofortige Evakuierung erforderlich. Niemand glaubt Dr. Chambers. Er hatte schon einmal eine Naturkatastrophe vorhergesagt. Nicht nur das: Chambers wird verdächtigt, ein Alien zu sein. Nur Mitarbeiterin Amanda glaubt ihm. Um ihr zur Flucht zu verhelfen, opfert sich Chambers.
Dr. Larry Chambers (Gregory Harrison) helped build the colony on the Janus Five. He and fellow scientist Amanda Harper (Kimberly Huffman) run computer simulations that show the planet's star will flash over in a matter of days, emitting waves of deadly radiation, so Dr. Chambers urges evacuation. This is not a popular recommendation, especially among the colony's leaders who include council chairman Franklin Murdock (William Atherton), security head Montgomery Bennett (Alan Scarfe) and Amanda's father, Ian Harper (Ken Pogue). They point out that Chambers has been wrong before - the colony had to be moved at great cost after he warned of deadly volcanic activity - and suggest that his judgment has been clouded by the death of his wife Elise. When that doesn't stop Chambers, Murdock and Bennett discredit him by falsely accusing him of being one of the aliens who originally inhabited the planet.
Le Dr Larry Chambers a aidé à construire la colonie installée sur Janus Five. Lui et la scientifique Amana Harper, ont créé une simulation sur ordinateur, démontant que les étoiles de cette planète étincelleront dans quelques jours, créant une vague de radiation mortelle... Il faut donc évacuer tout le monde et le temps est compté...
En una colonia espacial alejada del planeta Tierra, un científico dice tener pruebas de que en pocos días todo aquello será destruido debido a una serie de explosiones solares que están a punto de producirse e intenta avisar a todo el mundo para que se vaya de la colonia. Sin embargo no es capaz de ofrecer pruebas contundentes capaces de demostrar que lo que dice es cierto y no una mera prueba de fe.
Uno scienziato scopre che la stella della colonia Janus Five sta per emettere radiazioni letali e chiede l'evacuazione. I leader della colonia, ricordando un suo precedente allarme sbagliato, lo accusano invece di essere un infiltrato alieno.
