Trapped and alone on the planet Skaro, the Doctor is at the heart of the Dalek Empire - no sonic, no TARDIS and nobody to help. 2/12

When an underwater base comes under attack, the Doctor and Clara must save the frightened crew and defeat an impossible threat. 3/12

On a remote army outpost, a fearsome alien warlord called the Fisher King sets in motion a twisted plan to ensure his own survival. 4/12