Summary
Liz offers the Doctor a spare ticket to a conference in Paris on psi powers and psychic phenomenon; Professor Brockhurst, who was originally to attend the conference, recently choked to death in a restaurant. Their plane's engine unexpectedly explodes, but a telepathic young woman on the flight is able to keep it in flight. The Doctor keeps her mind focussed on her task until the plane lands, although this costs the young woman her life. Liz recognizes her as a student of Professor Hardin, Brockhurst's rival at Cambridge, but when they return to Cambridge to confront Hardin he drives them out of his office without explaining his work. Suspecting that Hardin is responsible for Brockhurst's death and is conducting unethical experiments upon student volunteers, the Doctor calls in the Brigadier and with Liz's help organises a mass protest against Hardin. Hardin has been conducting surgery on his students to release their psychic potential, and apparently has been using a psychokinetic student to kill his rivals; the plane was brought down to prevent the young woman from revealing Hardin's unethical experiments to the conference. The Doctor realizes that Hardin is trying to create an army of psychic assassins to sell to the highest bidder, but when he confronts Hardin he discovers that Hardin has also conducted experiments upon himself. Having killed his unstable assassin, Hardin attempts to crush the Doctor's lungs within his body, but at that moment the Brigadier enters and shoots him dead.
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