UNIT is called in when an important diplomat is attacked in his own home
- by a man who then vanishes into thin air. The Doctor & Jo spend a night in the haunted house & meet the attackers
- who have time-jumped back from the 22nd century in the hope of changing history. Travelling forward in time the Doctor & Jo find themselves trapped in a future world where humans are slaves & the Daleks have already invaded. Using their ape-like servants to Ogrons to maintain order the Daleks are now the masters of Earth. As the Doctor desperately works to discover what has happened to put history off-track the Daleks plan a time-jump attack on the 20th century. This novel is based on a Doctor Who" story which was originally broadcast from 1 to 22 January 1972. This title features the Third Doctor as played by Jon Pertwee with his companion Jo Grant & the UNIT organisation commanded by Brigadier Lethbridge-Stewart."