S1 • E5 Jan 29, 2007
5.6
The TARDIS lands on Phobos, moon of Mars - where extreme sports nuts of the future indulge their passion for gravity-boarding and wormhole-jumping. But there's something lurking in the shadows, something infinitely old and infinitely dangerous. It's not for nothing that 'Phobos' is the ancient word for 'fear'.
