From the Daily Mail:
Karen, 23, who plays sidekick Amy Pond, told The Mirror: 'Oh God no, it’s a family show. Perhaps there might be a DVD for the over-18s.
The story unfolds that newlyweds Amy and Rory Williams, played by Arthur Darvill, conceived a child in the Tardis.
But there will be no flashback scenes of them getting up to no good.
Amy then discovers the Doctor’s friend River Song, played by Alex Kingston, is actually her newborn daughter all grown up.
Gillan confirmed: 'River Song was conceived on the Tardis. It’s kind of insinuated, but never actually said.'
Speaking at a special Q&A screening this week, writer Steven Moffat said his intention to script in Adolf Hitler was to poke fun at the Nazi dictator.
He said: 'Hitler is iconic - in an evil and ghastly way.
'In Indiana Jones and the Last Crusade there was a brilliant gag where Indiana Jones accidentally gets Hitler’s autograph.
'I think if you really want to p*** of Hitler you don’t make him into an icon of evil, you take the mickey out of him... make him be punched by Rory.'
Karen added: 'The Minotaur is pretty scary and we’ve also got a monster called the Teselecta in Let’s Kill Hitler.
'It goes back in time to try to right the wrongs of the past.'
There will also be a few familiar faces in the first episode, with former stars Billie Piper, Freema Agyeman and Catherine Tate all taking on cameos.
Despite their return to the set, it will be their first screen venture with Smith, having played sidekicks to ex-Time Lord David Tennant.
A BBC source said: 'They don’t have a big part to play, but fans will love to see them return and they are trying to help Matt in an hour of need.
'It is a humorous scene and it opens the door to any of them if they wanted to come back and do some more filming in the future.'