Yep, I enjoyed this one's Tales Of The TARDIS episode so much that I just had to go and watch the original episodic version so soon.

The Curse of Fenric is an utterly mind-blowing Doctor Who serial. It's the perfect showcase of the Seventh Doctor and Ace and how toxic their relationship could be, with the Doctor cruelly breaking Ace's faith in him to beat Fenric.

Fenric is easily one of the best one-off Doctor WHo antagonists, with an intriguing shared history with the Doctor. The Haemovores are excellent too, and are easily among the most impressive monster designs from the classic series. You could have the Haemovores return in the new series, and you'd barely have to alter their look to make them work for a modern audience.