13/14 The Valeyard's true identity is revealed and the trial aborted.
12/14 The Doctor realises that if he can speed up the Vervoids life span, they will decay.
11/14 Bruchner plans to send the Hyperion III into the black hole of Tartarus.
10/14 The Vervoids begin to attack the crew and passengers.
9/14 The Doctor suspects Professor Laskey's party of a series of murders.