S20E9
Psychological Thriller
Written by Peter Grimwade
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Mawdryn Undead Part 1

Turlough, a rebellious schoolboy, makes a deal with the Black Guardian to destroy the Doctor in exchange for escape from Earth, but finds himself entangled in a complex web of time and space.

The story begins at Brendon Public School, where Turlough, a misfit student, and his friend Ibbotson, get into trouble when Turlough takes a vintage car for a joyride. After a crash, Turlough encounters the Black Guardian, who offers him a deal: destroy the Doctor in exchange for escape from Earth. Turlough agrees and is transported to a spaceship, where he learns to operate a transmat capsule. Meanwhile, the Doctor, Tegan, and Nyssa are dealing with a mysterious ship that has been in orbit for 3,000 years. The Doctor, Nyssa, and Tegan investigate the ship and discover that it is connected to the transmat capsule. Turlough uses the capsule to travel to Earth, where he plans to meet the Doctor. The Doctor, Tegan, and Nyssa follow Turlough to Earth, where they become embroiled in a confrontation with the Black Guardian and Turlough. The story explores themes of time, space, and the consequences of one's actions.


Events in This Episode

The narrative beats that drive the story

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Act 1

The story commences at Brendon Public School, where the audience meets Turlough, a disaffected and rebellious student, whose disdain for his Earthly existence is immediately apparent. Accompanied by his timid friend, Ibbotson, Turlough impulsively takes a valuable 1929 Humber for a joyride. His reckless driving culminates in a dramatic crash, sending the car through a hedgerow and into a field, causing considerable damage and minor injuries. Following the accident, Turlough experiences an out-of-body phenomenon, finding himself in a surreal, ethereal realm he perceives as limbo. There, he is confronted by the sinister Black Guardian, a powerful, malevolent entity who presents Turlough with a life-altering proposition: the opportunity to escape Earth, a planet Turlough openly despises, if he agrees to assassinate the Doctor. Initially, Turlough expresses moral reservations about committing murder, but his profound desire for liberation from his current life ultimately overrides his scruples. Under duress and with no apparent alternative, Turlough reluctantly accepts the Black Guardian's terms, sealing a dark pact. He subsequently regains consciousness back in the field, physically recovering but now mentally bound by a dangerous, secret mission that fundamentally reshapes his destiny and introduces the central conflict of the narrative.

Act 2

Following Turlough's sinister pact, the narrative shifts focus to the Doctor, Tegan, and Nyssa aboard the TARDIS. Tegan struggles with lingering trauma from the Mara, expressing a strong desire to return to Earth for comfort. Their journey is interrupted when the TARDIS experiences an unusual 'warp ellipse cut out,' indicating proximity to a fixed object in time and space. The Doctor materializes the TARDIS aboard an opulent, ancient spaceship, which they discover has been in perpetual orbit for 3,000 years, devoid of any crew. Simultaneously, Turlough, now back at school, finds a glowing crystal, a direct link to the Black Guardian, who reiterates his instructions. Turlough uses deception to escape the sickbay, heading towards an obelisk as instructed. On the spaceship, the Doctor and his companions locate a transmat terminal, discovering it was last activated six years prior, transmitting someone to Earth. Turlough, guided by the Black Guardian, uncovers a hidden transmat capsule near the obelisk and enters it, vanishing from Earth. He reappears on the spaceship bridge, where the Black Guardian materializes to forcefully remind Turlough of his commitment to destroy the Doctor, cementing his role as an unwilling assassin.

Act 3

The tension escalates as Turlough, now on the spaceship, attempts to resist the Black Guardian's influence, but the crystal remains fixed to his hand, symbolizing his inescapable bond. The Black Guardian forcefully reiterates Turlough's primary objective: to seek out and destroy the Doctor. Meanwhile, the Doctor, Tegan, and Nyssa rush back to the TARDIS, only to find it jammed and unable to dematerialize. The Doctor quickly deduces that the transmat beam, still active from Turlough's journey, is interfering with the TARDIS's systems due to their dimensional similarities. While the Doctor investigates the console, Turlough seizes the opportunity, sneaking into the TARDIS unseen by Tegan and Nyssa. The Doctor discovers Turlough inside, leading to their first direct encounter. Recognizing the urgency of the situation and the source of the TARDIS's malfunction, the Doctor formulates a plan: he will use the transmat capsule to return to Earth, taking Turlough with him, while Tegan and Nyssa remain in the TARDIS, tasked with following once the jamming signal is neutralized. The Doctor and Turlough materialize by the obelisk on Earth, with the Doctor immediately locating the transmat control unit, setting the stage for the next phase of their intertwined journey.