 Writer Terry Nation had created the Dalek race for "Doctor Who" in 1963, and thus assuring much of its early popularity.For the rest of the 1960s Nation had concentrated on writing for ITV film series, but in the early 1970s he returned to science fiction, contributing Dalek stories to "Doctor Who" again from 1973 to 1975 and in 1975 creating his own science-fiction show, "Survivors" (1975–77).