The TARDIS arrives in the CAGE - not a trap, but the College of Advanced Galactic Education, one of the most prestigious academic institutions in colonised space.
Not a trap. Or is it?
The Doctor's here to receive an honorary degree in Moral Philosophy. But there's something rotten at the heart of the Medical Facility. Someone is operating on the students. Someone without a conscience. Someone with access to a Sidelian Brain Scanner - a technology that hasn't been invented yet.
That someone is the ruthless Time Lord scientist known as the Rani - in her new incarnation. But will the Doctor and Peri recognise the Rani's hand before her trap is sprung?
Written By: Justin Richards
Directed By: Ken Bentley
Colin Baker (The Doctor), Nicola Bryant (Peri), Siobhan Redmond (The Rani), Andrew Bone (Vice Chancellor), Becky Wright (Lizzo), Mike Noble (Miklev), Charlie Morton (Reev)