Vislor ("Turlough") Turlough

One of the Fifth Doctor's Companions. When the Time Lord met him, Turlough was a schoolboy on Earth at Bendon School. After a minor car accident, he entered into a pact with the Black Guardian to kill the Doctor. During their adventure on Terminus, he made several half-hearted attempts, but failed. Finally, after the encounter with the Eternals, Turlough turned against the Black Guardian and, by throwing the Enlightenment crystal at him, freed himself. Afterwards, he helped the Doctor fight the Master. He then met the Doctor's First, Second and Third Incarnations on the Dead Zone of Gallifrey, and helped them defeat Borusa. Turlough went on to assist the Doctor in his battles against the Silurians and the Sea Devils, the Malus, the Tractators and the Daleks. Finally, Turlough was revealed to be a political prisoner from Trion sentenced to ten years' exile on Earth. After another battle against the Master on Sarn, Trion's prison planet, Turlough found that his exile had been rescinded. He returned to his homeworld with his newly-found brother, Malkon. As a Trion political prisoner, Turlough had been tattoed with the Misos Triangle.