S13E5
Tragic
Written by Louis Marks
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Planet of Evil Part 1

When the Doctor and Sarah land on the planet Zeta Minor in response to a distress call, they uncover a sinister alien force that has been killing off a human expedition, led by the obsessive Professor Sorenson, which has been exploiting the planet's resources.

The Doctor and his companion Sarah arrive on the planet Zeta Minor in their TARDIS after responding to a distress call. They find evidence of a human expedition led by Professor Sorenson that has been collecting crystals on the planet. However, they soon discover that the expedition has been plagued by a series of mysterious and gruesome deaths. As the Doctor and Sarah investigate, they realize that the planet itself seems to be alive and is actively hostile towards humans. The Doctor and Sarah must navigate the treacherous jungle and avoid the planet's deadly forces while also encountering a Morestran spacecraft that has been sent to capture Sorenson and study the planet. The Doctor and Sarah's actions are hindered by the planet's strange energy, which seems to be affecting their technology and even their minds. The story unfolds with a sense of urgency as night falls on the planet, and the Doctor and Sarah must escape the planet before it becomes too late.


Events in This Episode

The narrative beats that drive the story

31
Act 1

The narrative opens on the desolate, reddish-brown planet Zeta Minor, immediately establishing a grim atmosphere with multiple grave markers for deceased expedition members. Professor Sorenson, a gaunt figure, reveals an intense, almost maniacal obsession with exploiting the planet's rich crystal veins, dismissing the palpable danger. His subordinate, Baldwin, voices concern about the approaching night and the planet's history of mysterious deaths, believing the planet itself is a sentient, hostile entity. This initial conflict culminates in the terrifying, unseen force claiming two more lives—Braun, then Baldwin—who vanish struggling against an invisible assailant, leaving the expedition base deserted and confirming the planet's immediate, deadly threat. Simultaneously, the Doctor and Sarah arrive in the TARDIS, responding to a faint distress call that has pulled them thirty thousand years off course. Their initial exploration of the steaming jungle is fraught with peril, as Sarah experiences a disorienting mental assault from the planet's strange energy. They discover the expedition's graveyard and then the abandoned base, where the automatic distress button has been running for months. The Doctor's subsequent discovery of Baldwin's desiccated remains inside the base confirms the recent, gruesome fate of the crew, underscoring the urgency and danger of their situation as they realize they are too late for most, but perhaps not for all.

Act 2

Following the grim discovery of the expedition's fate, a new and formidable element enters the narrative: a Morestran space probe, dispatched from a distant galaxy to investigate the prolonged silence from Professor Sorenson's team. Led by Commander Salamar, the Morestrans operate with military precision, their primary objective to locate Sorenson and assess the situation on Zeta Minor. Their arrival immediately complicates the Doctor and Sarah's investigation. The Morestran landing party, observing the mysterious TARDIS, quickly deems it a potential threat and captures it, along with Sarah, transporting her to their orbital probe for interrogation. Concurrently, Professor Sorenson reappears on the planet's surface, surprisingly alive but exhibiting increasingly erratic behavior, evasively recounting the expedition's losses while claiming a vital discovery. He leads the Morestrans to the abandoned base, where they find the Doctor alongside Baldwin's corpse. Misinterpreting the Doctor's presence and his alien nature, the Morestrans swiftly apprehend him. Back on the probe, Salamar conducts a stern interrogation of both Sarah and the Doctor, dismissing their explanations about the TARDIS and the distress call. Her suspicions harden, leading her to conclude that the Doctor and Sarah are hostile alien infiltrators, responsible for the expedition's demise, thereby shifting the blame and setting the stage for their dire predicament.

Act 3

With both the Doctor and Sarah now firmly imprisoned by the Morestrans, Commander Salamar's initial suspicions escalate into an unshakeable conviction. Despite her landing party's exhaustive search of the jungle yielding no other signs of hostile life, Salamar remains resolute in her belief that the Doctor and Sarah are the alien infiltrators responsible for the expedition's tragic end. She dismisses their pleas and explanations regarding the distress call and their true intentions, asserting with cold authority that Morestran interrogation methods will inevitably extract the 'truth.' Subsequently, Salamar issues a chilling order for their execution, sealing their grim fate. Confined to the magnetically locked crew quarters within the expedition base, the Doctor and Sarah face an imminent and unjust demise. The atmosphere grows heavy with the weight of their predicament. However, the Doctor, ever observant and resourceful, quickly identifies a critical vulnerability: the base's power system is critically low, a condition that has inadvertently weakened the magnetic seals on the windows. This crucial observation ignites a desperate, immediate plan for escape. The act culminates with the Doctor and Sarah initiating their perilous breakout attempt, pushing against the weakened window, leaving Part One on a tense cliffhanger as their lives hang precariously in the balance against a determined and misinformed enemy.