The BBC has teased fans of Doctor Who with four new snaps from the forthcoming eighth series of the long-running sci-fi drama.

New Doctor Peter Capaldi is seen wearing Matt Smith's clothes in one of the pics, while he and assistant Clara Oswald (Jenna Coleman) have a more Victorian look in two of the other images.

And the fourth snap shows fan favourite Madame Vastra (Neve McIntosh) gesturing at a pin board.

Meanwhile show boss Steven Moffat has been sharing Capaldi's thinking on his look as the Doctor.

He told SFX: "He wanted to be quite stark. Stark and skinny. A stick-insect sort of thing. Clara actually calls him a grey-haired stick insect at one point.

"We had some hilarious pictures of Peter just dressing up. It was all coming from him because he's really into his clothes. I didn't feel qualified to go and chat too much about it.

"Certainly the costume didn't go anywhere until I shut up. The thing I've learned about showrunning is you need to know the bits you're bad at!"

The show returns on 23 August.