Dark times ahead for Doctor Who
The Timelord enters the space race and ends up battling against a terrifying enemy in the new series of Doctor Who.
The Doctor (Matt Smith) is reunited with regular sidekicks Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill), as well as Alex Kingston who reprises her role as River Song.
They find themselves chasing a mysterious astronaut and fighting aliens with the power to wipe people's minds as 1969 America makes plans to send men to the moon.
Writer Steven Moffat admitted the show featured some of the darkest opening episodes ever seen - including the death of a major character.
He said: "First of all, you make Doctor Who frightening to appeal to children. It's the children who find it frightening, not the adults, and children absolutely rank Doctor Who stories in order of frightened-ness - that's what it's about.
"You put the jokes in and the silly bits in for the adults and you put the scary bits in for the kids."
The opening episodes see the Doctor cross paths with US president Richard Nixon.
He is not the first political big hitter to feature in the show - the last series saw the Doctor team up with Winston Churchill to take on the Daleks.
Future episodes see Downton Abbey star Hugh Bonneville play a villainous pirate and an appearance from former Coronation Street star Suranne Jones in an episode called The Doctor's Wife.
Members of the cast and crew were speaking at a preview event at Olympia 2 in Kensington, west London, which is home to an exhibition dedicated to the BBC1 series.