Matt Smith has said that Doctor Who fans can expect to see a more earthly threat than usual in this year's Christmas special.

The one-off episode, to be broadcast on BBC One on Christmas Day, is a retelling of the classic Charles Dickens story A Christmas Carol.

Smith told PA: "The episode features a wonderful shark, which I was very excited about.

"I always wanted to explore the aquatic - viewers can expect Jaws with a twist."

The episode will see Michael Gambon play the Ebeneezer Scrooge-like character Kazran Sardick, while the Doctor tries to save the old man's soul.

"It's a fun old yarn and the Doctor simply loves Christmas," Smith added.

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