A medieval alchemist (Klaus Kinski), knight (Harvey Keitel) and priest (Fernando Rey) mistake a flying-saucer alien for a dragon.
Klaus Kinski
as Boetius
Harvey Keitel
as Klever
Fernando Rey
as Fray Lupo
Maria Lamor
as Princess Alba
José Vivó
as Count of Rue
Julieta Serrano
as Dama de compañía
Miguel Bosé
as Ix
Josep Maria Pou
as Caballero Verde
Carlos Tristancho
as Pregonero
Paco Catalá
as Pastor
Santiago Álvarez
as
José María Cañete
as Campesino