London, 1963, and the Doctor returns to Coal Hill School with his new companion Ace, where he has unfinished business. His oldest foes, the Daleks, are on the trail of Time Lord technology – an artefact the Doctor himself left behind on Earth. Enlisting the assistance of the local military, the Doctor must protect the Gallifreyan secret of time travel as two opposing Dalek factions meet in an explosive confrontation, with the fate of the entire Universe at stake!
On the planet Terra Alpha, the population constantly displays happy smiles. Anyone feeling remotely glum disappears. Quickly. Having heard disturbing rumours, the Doctor (Sylvester McCoy) and Ace arrive to topple the entire regime.
The Doctor and Ace visit England in 1988, where three rival factions – the Cybermen, a group of Nazis and a 17th Century sorceress named Lady Peinforte – are attempting to gain control of a statue made of a living metal, validium, that was created by Rassilon as the ultimate defence for Gallifrey. Can the Doctor plays the three factions off against one other and eventually defeat to the Cyber Leader?
Although Ace hates clowns, the Doctor decides to take his companion to the Psychic Circus on the planet Segonax. There they find a group of scared performers who live in fear of the sinister and creepy Chief Clown. But what is so dangerous about this particular circus, why is there such a small audience and will Ace be able to overcome her fear before it’s too late?