In return for three quarters of all his fees Dr Trevelyan is given a practice in London's West End and a resident patient. All seems well until the patient is left terrified by a number of strange occurrences relating to his criminal past life. With all his powers of detection, it seems even Sherlock Holmes is powerless to help him!
Classic comedy about the Home Guard unit of Walmington-on-Sea. Captain Mainwaring assumes command of the newly formed platoon of volunteers.
The Interplanetary Mining Corporation, represented by Captain Dent, arrives on the planet claiming that the colonists have no right to be there.
With Jo held prisoner in his TARDIS, the Master forces the Doctor to take him to the underground city of the primitives. Any sign of treachery from the Doctor and Jo will die.
When Jo attempts to break into the IMC ship she is captured and held hostage.