The Doctor’s struggle to uncover the truth behind Professor Watkins' disappearance and International Electromatics' manipulation of technology.

The Doctor and Jamie arrive at Professor Watkins’ address, only to find the doorbell unanswered despite repeated attempts. Their persistence finally provokes Isobel, Watkins’ niece, who answers with visible irritation. …

In Vaughn’s office, the Doctor and Jamie are subtly outmaneuvered as Vaughn—under the guise of technical assistance—extracts the TARDIS’s critical circuits from the Doctor. The exchange begins with Vaughn dismissing …