After arguments, the Inquisitor warns both the Doctor and the Valeyard, reminding them that they are in judicial proceedings and to behave. The Valeyard then presents evidence relating to the Doctor landing his TARDIS on the planet Thoros Beta where the Doctor and Peri flee in order to avoid being accused of a crime they did not commit. In the process they arrive at a experimental laboratory where they rescue King Yrcanos.

Dr. Crozier prepares to transplant Mentor's brain with the help of the Doctor, while king Yrcanos, Peri and Dorf prepare to attack the Mentors. In the laboratory, Dr. Crozier decides that Peri may be a compatible body donor and sends for her.