When the Doctor receives a mysterious call from Clara, the woman that he's been seeking since he has seen her die twice, he arrives in 21st century Earth and discovers that something is using wi-fi to download human minds into the Internet... and feed on them.

Something ghastly is afoot in Victorian Yorkshire, as bodies are found with their skin a waxy, glowing red.

Hedgewick's World of Wonders: the perfect theme park day out - and ground zero for a deadly silver resurrection.

Someone is kidnapping the Doctor's friends, leading him towards the one place in all of time and space that he should never go.