 Three scripts for "Out of This World", adaptations of Philip K. Dick's "Impostor" and Clifford D. Simak's "Immigrant" as well as an original story called "Botany Bay", were supplied by Terry Nation.These scripts were Nation's first professional foray into the genre for which he would become best known; he would later go on to create the popular Daleks for the science fiction series "Doctor Who" as well as his own science fiction television series "Survivors" and "Blake's 7".An adaptation of John Wyndham’s short story "Dumb Martian" was originally intended to launch the series.