The Greatest Game

The Greatest Game is the sixth episode of the tenth season of Doctor Who, and sees the return of Fenric. Ian Briggs, writer of the original The Curse of Fenric serial, guest writes this episode.

Synopsis
"I watched the universe burn, Doctor. All to have my revenge against you'" - Fenric

Earth has changed. Its timeline has been altered by an old enemy of the Doctor; Fenric, and his Haemovores roam the earth. The wolves of Fenric pursue the Doctor and Christina, with their master seeking his vengeance.