Voir sur FrenchStream. A science-fiction film centered around planet Earth receiving a coded message from outer space and the subsequent disappearance of 12,000 inhabitants of Sepuvedra, a free-trade port. The government and the army are convinced that they have been kidnapped by aliens and Professor Larsen, an eminent astrophysicist and UFO expert, is assigned to lead an urgent investigative mission into the deserted town.