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With viewers still reeling from the shocking news that River Song is actually Amy and Rory's baby, Bafta-nominated actor, Matt Smith, provides a sneak-peek at what is coming up in the new episodes of Doctor Who.

"I thought it was brilliant because it's such a great science fiction pay-off," explains Matt as he reveals how he felt when he learnt the truth about River Song. "Steven Moffat set it up so well and it now leaves the story open to go in so many different directions. She's Amy and Rory's daughter which is mad, but yet brilliant, and it's going to be really interesting to see how the dynamic between all of the characters shifts."

Despite Melody Pond being kidnapped at the end of A Good Man Goes To War, Matt says viewers can rest assured that Alex Kingston, who plays River Song, will be back and there are more shocks in store. "We get to learn a lot more about River in Let's Kill Hitler" he explains, "and she's on her best flirty form; the River I love! It's certainly Alex's episode and we had great fun filming the scenes, so hopefully we have some good on-screen chemistry."

New monsters are also set to make an appearance, sending children and adults alike scuttling behind the sofa in true Doctor Who style. "I think it's fantastic the way the show can tap into people's primal fears as children" says Matt, specifically referring to Mark Gatiss's episode Night Terrors. "Mark has come up with a really clever idea by featuring a dolls house with terrifying and creepy dolls – it's a brilliant adventure-packed episode and Danny Mays, who guest stars, is superb in it."

The Tin Tin actor isn't the only high-calibre guest artist to secure a role in Doctor Who. Upcoming episodes also feature funny men David Walliams and James Corden. "James reprises his role as Craig, who appeared in The Lodger last year," explains Matt. "He's back in an episode which also features the Doctor's arch enemies, the Cybermen. We had such fun on set; it was hard to keep a straight face when we were filming.

"David Walliams was also hilarious" continues Matt. "He plays a character called Gibbis and he had to wear a lot of prosthetics for the part. Once he was all made up he looked a lot like a giant Mole, so it was hard to take him seriously!"

However, Matt's tone does become more serious when talking about the fate awaiting the Doctor...

"The Doctor died at the start of the series" explains Matt. "He was shot in the future by someone in a space suit and, despite the adventures he goes on in these next few episodes, inevitably he's moving closer towards his own death. Amy, Rory and River are aware of his fate but they have no way of stopping it. I can't tell you what happens but Steven has set up an explosive finale."

But can he reveal if his Stetson makes an appearance? "Yes, I can tell you the Stetson is back; I do love a good hat!" chuckles Matt. "The Doctor also has a new coat; a long green moleskin one. We always wanted the Doctor's outfit to evolve and the coat certainly kept me warm when filming during the winter.

"I still haven't lost my clumsy streak though," sighs Matt. "We were filming the final scenes last month in a cornfield and, needless to say, I was the one who tripped over and twisted my ankle!" If only there had been a doctor around...