Thor's Hammer

Synopsis
The Doctor and Christina return to london to find a deserted wasteland, realizing something has changed in the timeline, The Doctor locks the TARDIS onto a temple in Bolivia. Guided only by a man in black, The Doctor and Christina uncover a world of secrets, lies and traps. As the pair prepare to face off against the Cult of Helheim, something is waiting, something ready to bring about the end of the world.