S1, E4: From Mafasca, in the plains of Fuerteventura, to Pardal, in the mountains of Albacete, passing through the light of Cayon in Cantabria, we are talking about intelligent luminosities. These are seen at night and have even followed witnesses. They are the most commonly seen lights, undoubtedly a phenomenon that is part of another of the strangest aspects of the UFO theme: The foo- fighters.