'This is the Gyre - the most hostile environment in the galaxy...' 250,000 years' worth of junk floating in deep space, home to the shipwrecked Sittuun, the carnivorous Sollogs, and worst of all - the Humans. The Doctor and Amy arrive on this terrifying world in the middle of an all-out frontier war between Sittuun and Humans, and the countdown has already started. There's a comet in the sky, and it's on a collision course with the Gyre...When the Doctor is kidnapped, it's up to Amy and "galaxy-famous swashbuckler" Dirk Slipstream to save the day. But who is Slipstream, exactly? And what is he really doing here?A thrilling, time travel adventure featuring the Eleventh Doctor and Amy, as played by Matt Smith and Karen Gillan in the spectacular hit series from BBC Television