Terror of the Vervoids is an episode of the Sixth Doctor of the British science fiction television series Doctor Who. It is the third part of Trial of a Time lord and the only episode ever to feature the Vervoids as an enemy.
Still slightly shaken by Peri's death, the Doctor presents evidence from the Matrix in his defense.
The starliner Hyperion III, travelling from Mogar to Earth in 2986, carries several guests ranging from scientists to Mogarians and even a private investigator. The hull has been converted into a hydroponics centre for Professor Sarah Lasky's experiments and the cargo bay holds vionesium, a valuble metal being drained from the beautiful Mogar. Many of the passengers will not survive the journey, for in order to protect a secret hidden on the liner, one of them will become a murderer.