The Doctor thought he had defeated the Nucleus of the Swarm.
He was wrong. It survived within the TARDIS, and now has brought it back to Titan Base, to the point of its own creation.
If the Doctor is to save the day, he must risk everything he holds dear.
- Format: CD-Audio
- Publisher: Big Finish Productions Ltd
- Publication Date: 26/08/2014
- Category: Science fiction
- ISBN: 9781781783306