The Doctor follows a Time Lord distress signal to a mysterious asteroid in a Bubble Universe - could there really be another living Time Lord out there?
Christmas Eve 1892. When a chilling menace threatens Earth, an unorthodox governess, Clara, calls on the Doctor for help. But the Doctor is in mourning. Will the Doctor really abandon humankind?
The search for Clara brings the Doctor to London, where something deadly is in the Wi-Fi.
The Doctor takes Clara to the Festival of Offerings, but the Old God is waking...
A solar tsunami sends the TARDIS hurtling towards a factory on earth where human doppelgangers are used to mine dangerous acid.. Can the Doctor prevent an all out civil war?
On a Russian submarine, a frozen alien warrior is waking up, just as the TARDIS arrives.
Something terrifying is hiding in Caliburn House, and the Doctor joins the ghost hunt.
The TARDIS has crashed, Clara is lost, and the Doctor has 30 minutes before it explodes!
Something ghastly is afoot in Victorian Yorkshire, as bodies are found with red skin.
The perfect theme park day out is also ground zero for a deadly silver resurrection.
The Doctor has a secret he will take to his grave. And it is discovered...