Astronauts rescued from a mission to mars are kidnapped when they arrive back on earth. They seem to have been irradiated, and can now kill people merely by touching them. But the Doctor discovers the astronauts have been replaced with Alien ambassadors who are being forced to behave in a hostile manner. With The Doctor traveling to the alien mother ship, and Liz kidnapped, The Brigadier is left wondering who to trust.

When several young girls are found dead, left hideously aged and void of blood, Dr. Marcus suspects vampirism. He enlists the help of the Vampire Hunter. Mysterious and powerful, Kronos has dedicated his life to destroying the evil pestilence. Once a victim of its diabolical depravity, he knows the vampire's strengths and weaknesses as well as the extreme dangers attached to confronting the potent forces of darkness.

Receptionist Anne’s new relationship with nascent writer Peter is opening her eyes to a new lifestyle, one far removed from her comfortable middle-class background.

A man, Harris, wakes up in a hotel on a small island after a shipwreck. He keeps recognising flashes of what he sees, until he realises his visions are of actions yet to come, culminating in murder.