The latest issue of Doctor Who Magazine - as well as confirming the return of David Tennant and Billie Piper for the TV programme's 50th Anniversary Special - gives special previews of the next four episodes in the current run of stories.
The Rings of Akhaten
In a galaxy far, far away, seven worlds orbit the same star, all sharing a belief that life in the universe originated here, on the planet of Akhaten. For her first trip into space and time, the Doctor takes Clara to Akhaten's vast, bustling Tiaanamaat market, in time for the once-in-a-millennia [sic] Festival of Offerings. But something is waiting for them on Akhaten, something with a mighty appetite, feeding on memories of love, loss, birth, death, joy and sorrow. Something hungry...
August 1983. A Soviet submarine, the Firebird, is sinnking, fast. Seawater roars through the sub. A creature is loose in the hold, an alien soldier who's been lying dormant in the ice for five millennia. "Harm one of us, and you harm us all. By the Moons, this I swear."
Amidst it all, a grinding, wheezing roar, as the TARDIS materialises on the bridge. The Doctor and Clara are about to meet the greatest hero the proud Martian race ever produced. "Is it that dangerous?" asks Clara.
This one is.
November 1974. Clara and the Doctor arrive at Caliburn House: a spooky mansion sat alone on a desolate moor. Within its walls, a ghost-hunting professor and a gifted psychic are searching for the Witch of the Well. Her apparition appears throughout the history of the building... but is she really a ghost? And what is chasing her?
Journey to the Centre of the TARDIS
The space-salvaging Van Baalen Bros - Gregor, Bram and Tricky - are about to make the haul of a lifetime. A bigger-on-the-inside, infinitely reconfigurable space-time machine. Just imagine what that would be worth, all chopped up and sold on to the highest bidder! Of course, the Doctor isn't going to let his beloved ship go without a fight - but the battered TARDIS is collapsing in on itself, and Clara is lost somewhere in its depths. Is anyone going to get out alive?
All episodes star Matt Smith as the Doctor with Jenna-Louise Coleman as Clara.