Following a spot of uncharacteristic intoxication, the Doctor wakes to discover that the TARDIS has materialised in the service ducting of the Vipod Mor, a huge craft which is itself floating in deep space. Furthermore, the console has detected time spillage: someone or something is tampering with time! Such experimentation could not only damage the Space/Time continuum but destroy the past and future history of the Universe. The Doctor and Peri board...