Trapped in an isolated cottage, Captain Cavendish thinks he is seeing ghosts. The only person who might understand and help is Kate Lethbridge-Stewart ... but when she arrives, she realises that Cavendish is key in a plot to summon the Daemons back to the Earth. With time running out, Kate discovers that sometimes even the familiar can turn out to be your worst nightmare.

Retired commander of the United Nations' Intelligence Taskforce, and long-time associate of the mysterious time traveler the Doctor, Brigadier Alistair Lethbridge-Stewart faces the toughest battle of his military career when he is embroiled in a plot unwittingly set in motion by university chancellor Victoria Waterfield, herself a former companion of the Doctor, to take over the Earth by an evil alien entity called the Great Intelligence, aided by its ferocious robot Yeti cohorts. Can the Brigadier defeat this menace to the Earth without the Doctor's help?

Gordon "Gordy" Lethbridge-Stewart thought he had left the world of his grandfather behind him. As a research scientist, all he was interested in was developing new technologies. Unfortunately, what he doesn’t know is that retired UNIT operative Captain Douglas Cavendish has given him alien technology to develop his ideas with … and that leads to a great deal of trouble indeed! Trouble that forces Kate Lethbridge-Stewart to make a life or death choice!

Ian Levine's version of the 'Wilderness era' Doctor Who story with Sylvester McCoy.