Project Zeta Sigma (unproduced TV story)

Project Zeta Sigma was an unproduced serial that would have been the first story of the Fifth Doctor. It would not have carried on straight from Logopolis. It would have featured nuclear disarmament, but John Nathan-Turner claimed it would not work and Castrovalva replaced it. (REF: Doctor Who - The Handbook: The Fifth Doctor)

External links

• Doctor Who: A Brief History of Time (Travel): The Lost Stories - Project Zeta Sigma