Vislor Turlough

Vislor Turlough
Doctor Who character
Turlough in a promotional photograph for Doctor Who.
First appearance	Mawdryn Undead
Last appearance	Planet of Fire The Caves of Androzani (cameo)
Portrayed by	Mark Strickson
Information
Affiliated	Fifth Doctor
Species	Trion
Home planet	Trion
Home era	1983

Vislor Turlough is a fictional character played by Mark Strickson in the long-running British science fiction television series Doctor Who. He was a companion of the Fifth Doctor, being a regular in the programme from 1983 to 1984. Turlough appeared in 10 stories (33 episodes).

When Turlough first appears in the serial Mawdryn Undead, he is a student of retired Brigadier Lethbridge-Stewart (himself a former companion of the Doctor) at the Brendon Public School, but it becomes apparent that he is not what he seems. He is contacted by the malevolent Black Guardian, who offers to take him home if he kills the Doctor. He also appears familiar with concepts of time travel and matter transmission. At the end of the serial, Turlough asks to accompany the Doctor. Despite Tegan and Nyssa's suspicions, the Doctor accepts Turlough as part of the TARDIS crew.

During the course of the next two serials, Terminus and Enlightenment (collectively known, together with Mawdryn Undead, as the Black Guardian Trilogy), Turlough finds himself unable to decide whether or not to carry out his assignment from the Black Guardian, but eventually rejects him in favour of loyalty to the Doctor. Although always slightly cowardly, with excellent instincts of self-preservation and a streak of ruthlessness, his relationship with the Doctor and Tegan improves with time (Nyssa having departed at the end of Terminus). He is one of the few companions capable of operating many of the TARDIS's systems, being able to run a diagnostic in The Five Doctors and program the TARDIS to retrieve the Doctor in Planet of Fire. Initially expressing a desire to return home, he continues travelling with the Doctor and Tegan until Tegan leaves at the end of Resurrection of the Daleks.