The Ultimate Vampire Resource and Directory

The series was produced by Richard Fell, who the previous year had overseen The Quatermass Experiment, a live remake of the 1953 TV series of the same name also largely absent from the BBC archives.

In the Yorkshire Dales, a group of scientists receive radio signals from the Andromeda Galaxy. Once decoded, these give them a computer program that can design a human clone. One physicist decides it is a Trojan horse and decides to destroy the computer.