There are strange goings-on at a comprehensive school - UFOs, over-intelligent children, and odd-tasting school dinners. This attracts the attention of the Tenth Doctor, Rose and Mickey Smith, as well as a couple of old friends…

Dessicated corpses, terror in the canal and a visit to the sinister House of Calvierri – the Doctor takes Amy and Rory for a romantic mini-break, as the Tardis touches down once again. But 16th-century Venice is not as it should be. The city has been sealed to protect it from the Plague, although Rosanna Calvierri may have other plans...

The trio arrive at a hotel where the layout of the rooms keeps changing. It also contains rooms that hold the greatest fears of each visitor.

The Doctor gets a Stetson (and a gun!), and finds himself the reluctant Sheriff of a Western town under siege by a relentless cyborg, who goes by the name of the Gunslinger. But who is he and what does he want? The answer seems to lie with the mysterious, Kahler-Jex, an alien doctor (yes another one!) whose initial appearance is hiding a dark secret.

The Doctor and Clara save the frightened crew from a threat in an underwater base, but the Doctor questions the haunting.

An alien warlord sets a twisted plan in motion in order to ensure his survival on a remote Army outpost, and the Doctor may have to do something unthinkable.

Earth has been invaded and Bill is living alone, an isolated figure surviving in occupied Britain. The Doctor is imprisoned and appears to be on the side of the enemy, flooding the airwaves with fake news. Bill and Nardole must embark on a deadly mission to rescue the Doctor and lead the resistance against the new regime, whatever the cost.