Zeta

Zeta was a letter in the Greek language alphabet of Earth, originating in the early period of human history.
It was used in the following contexts:
== Doctor Who Universe ==
* Zeta Minor (TV: Planet of Evil)
* Zeta Cancri (PROSE: K9 and the Zeta Rescue)
* Zeta Reticuli Four (PROSE: First Frontier)
* Zeta Major, an asteroid (PROSE: Zeta Major)
== Behind the scenes ==
* Zeta Major (novel), a BBC Past Doctor Adventures novel
* K9 and the Zeta Rescue (novel), a book in The Adventures of K9 series
* Project Zeta Sigma (TV story), an unproduced serial that would have been the first story of the Fifth Doctor (REF: Doctor Who The Handbook: The Fifth Doctor)