Spoiler
'The Crimson Horror' airs at 6.30pm on Saturday 4 May on BBC One. To whet your appetite, here are ten hints for the episode...
» Remember the "movie" Wild Wild West?
» Somewhere mentioned by The Ninth Doctor in Rose gets a mention, and Strax is wary of it.
» Matt Smith is channeling a role performed by Benedict Cumberbatch. No, not that one.
» 65 million years ago?
» The Doctor does a lot of kissing.
» Something that happens in ‘The Unicorn and the Wasp’ happens here.
» Fifth Doctor fans will be very happy. Twice.
» Something forbidden in a William Hartnell story is requested here.
» Did Strax just meet the inventor of the satnav?
» A familiar face or two from ‘The Bells of Saint John’ return.
» Clara is faced with an unexpected spot of blackmail.
Spoiler
Is the Fifth Doctor twice the emergence of 10?