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One of the Fifth Doctor's Companions. When the Time Lord met him, Turlough was a schoolboy on Earth at Bendon School where Brigadier Lethbridge-Stewart taught mathematics. He was saved from death by the Black Guardian who placed him amongst the TARDIS crew, intending to use him as his agent to assassinate the Doctor (6F).

Turlough is blunt, occasionally aggressive, but has an engaging personality. Despite his bluntness, he's chirpy and ever ready with an amusing quip.

During their adventure on Terminus, he made several half-hearted attempts to kill the Doctor, but failed. Finally, after the encounter with the Eternals, Turlough turned against the Black Guardian and, by throwing the Enlightenment crystal at him, thereby severing his bond with the evil entity (6H).

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 (6K).

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 After another battle against the Master on Sarn, Trion's prison planet, Turlough found that his exile had been rescinded.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 (6Q).

As a Trion political prisoner, Turlough had been tattoed with the Misos Triangle.

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Born in Statford-on-Avon in 1961, Mark Strickson was brought up in the small village of Ilmington. His father was a professional musician and Mark had learned to play several instruments - as well as singing in the Trinity Church choir - by the time he went to grammar school, where he continued his musical training.

After finishing school, Mark went to RADA, where he studied music and acting. His first acting job was as part of the Mikron Theatre Company, who travelled the canals of Britain on a narrow boat performing up and down the country. Mark wrote and composed many of the plays performed by the company over the two years he worked with them.

Leaving the theatre for a while, Mark gained his first television roles in "Celebration" and "Strangers", both for Grenada television. For the BBC he appeared in "Angels", and "Juliet Bravo" before being auditioned for the role of Turlough. Mark found himself in the enviable

position of having to choose between the role of 'Turlough' and the part of an ambulance driver in "Angels", which he had also been offered.

After leaving "Doctor Who", Mark played the young Scrooge in a remake of Dickins' "A Christmas Carol" (1985), he also appeared in "Casualty" (1986) playing the part of the 'Gynaecological Registrar' in the episode "Absolution", and in "Rafferty's Rules" (1987).

In 1988 he emigrated to Australia with his wife, actress Julie Brennan, where he took a break from acting to study for a degree in zoology. Mark returned to acting appearing in "Police Rescue" (1990) playing "Carter" in episode"Speeding"

He returned to UK in 1995, and in 1996 he produced a number of wildlife films for television. He made film appearances in "Lust in Space (1998) a video production as the 'Prosecutor' and in 2001 he played 'Guardian Force' in "Advanced Warriors" .

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