The first manned spacecraft, fired from an English launchpad, is first lost from radar, then roars back to Earth and crashes in a farmer's field, and is found to contain only one of the three men who took off in it; and he is unable to talk but appears to be undergoing a torturous physical and mental metamorphosis.

British reporters suspect an international cover-up of a global disaster in progress... and they're right. Hysterical panic has engulfed the world after the United States and the Soviet Union simultaneously detonate nuclear devices and have caused the orbit of the Earth to alter, sending it hurtling towards the sun.

In a small English village everyone suddenly falls unconscious. When they awake every woman of child bearing age is pregnant. The resulting children have the same strange blond hair, eyes and a strong connection to each other.

An American village is visited by some unknown life form which leaves the women of the village pregnant. Nine months later, the babies are born, and they all look normal, but it doesn't take the "parents" long to realize that the kids are not human or humane.

Set in 1970, a team of scientists decipher a mysterious signal from space and discover that it provides instructions to build a powerful super-computer. Once built, this computer provokes argument between two of leading team members, Fleming and Dawnay, over the machine's real intentions as it provides further instructions to create a living organism, which Dawnay starts to develop. Later it appears to compel lab assistant Christine to commit suicide, and when the organism is fully developed, it appears in the exact form of Christine, and named Andromeda. But what is the purpose of this "creature" ...?

A for Andromeda is a remake of the 1961 BBC science fiction classic A for Andromeda. 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.