Doctor Who fans will be left quaking by a rather more down-to-earth creature than the usual weird and wonderful monsters this Christmas - a shark.
The festive special, to be shown on BBC One on Christmas Day, will feature the creature from the deep in a retelling of the classic Dickens tale A Christmas Carol.
Actor Matt Smith said: "The episode features a wonderful shark which I was very excited about.
"I've always wanted to explore the aquatic - viewers can expect Jaws with a twist."
The episode revolves around an Ebeneezer Scrooge-like character, Kazran Sardick, who is played by veteran actor Michael Gambon.
The Doctor takes on the role of the Christmas ghosts to save the old miser's soul.
"It's a fun old yarn and the Doctor simply loves Christmas," said Matt.