This series narrates the adventures of a group of Spanish marines during the search for a habitable planet in order to save humanity since on Earth there is no room for more population or to build more houses. This search is carried out on board the ship "Plutón BRB Nero", built in the Badajoz shipyard by the shipowner Nero. The mission has been ordered by Maculay Culkin III, President of the United States of the World.