The Daleks (also known as The Mutants and The Dead Planet) is the second serial in the British science fiction television series Doctor Who, which was first broadcast in seven weekly parts from 21 December 1963 to 1 February 1964. It is the first serial to be entirely set on an alien planet. It was written by Terry Nation and directed by Christopher Barry and Richard Martin. This story marks the first appearance of the Doctor's greatest extraterrestrial enemies, the Daleks, and is also the first to feature recurring Skaro people, the Thals.