The planet Aldebaran has been colonized by humans for more than a hundred years. With no news from Earth, an organized society is rapidly established. But when a village is destroyed by a sea monster, the Mantrisse, Kim and Marc, survivors of the incident, decide to warn the authorities. A race against time to save the planet begins… Aldebaran is the first cycle of the saga The Worlds of Aldebaran, created by Léo. This science-fiction classic is followed by the Betelgeuse cycle.