S13E7
Tragic
Written by Louis Marks
View Graph

Planet of Evil Part 3

A scientist's quest for positron material becomes a desperate fight for survival as his crew is killed off one by one by a hybrid creature and antimatter.

The story begins with the crew of a space probe trying to retrieve positron material from the planet Zeta Minor. Doctor Sorenson, a civilian scientist, is on board with his companions, including Sarah and the Doctor. The crew faces numerous challenges, including conflicts over the positron material, encounters with a hybrid creature known as Antiman, and struggles with the ship's systems. As the crew members are killed off one by one, the Doctor and Sarah must work together to uncover the truth behind the strange occurrences. The story takes a turn when the Doctor discovers that Sorenson's antimatter experiments have gone wrong, causing the ship to be pulled back to Zeta Minor. The Doctor and Sarah must navigate the treacherous situation and find a way to escape the planet and the hybrid creature.


Events in This Episode

The narrative beats that drive the story

32
Act 1

The segment opens with the crew in disarray, believing the Doctor dead after his disappearance into a vortex. Controller Salamar prepares for an immediate launch from Zeta Minor, but a heated conflict arises with Professor Sorenson, who adamantly insists on retaining his positron material, deemed a hazard by Salamar. Unbeknownst to the crew, Sorenson secretly retrieves one of the dangerous canisters, highlighting his obsessive dedication. Sarah, having sneaked away, discovers the Doctor alive but unconscious, clutching a mysterious toffee tin. Vishinsky, alerted to their presence, intervenes to rescue the Doctor and Sarah, bringing them aboard. As the ship attempts takeoff, it encounters severe gravity drag, inexplicable to Salamar. The Doctor, having recovered, reveals that antimatter is still aboard the vessel, explaining the force pulling them back, and discloses that his toffee tin contains a small amount of antimatter, which paradoxically saved him from the void. This revelation shifts the crew's understanding of their predicament from a simple escape to a struggle against an internal force. Salamar, though initially skeptical, dispatches Morelli to jettison the Doctor's antimatter. However, the mission takes a grim turn when Sorenson, exhibiting increasingly erratic behavior and ominous glowing red eyes—a subtle but chilling sign of his ongoing transformation—intercepts and kills Morelli. This violent act confirms the presence of the mysterious 'animal' on board, directly linking it to the antimatter and escalating the threat from an environmental hazard to a murderous entity within the ship. The act concludes with the chilling realization that the danger is not external, but now internal and actively hunting the crew, setting a terrifying precedent for their journey.

Act 2

Following Morelli's death, the space probe, despite being in free space, inexplicably loses speed and becomes stationary, suspended by an unseen force. This phenomenon validates the Doctor's earlier warnings about residual antimatter, intensifying the crew's growing unease. The discovery of Morelli's desiccated body, identical to previous victims, fuels fear and confusion, especially after De Haan reports seeing an 'animal' in sector three, confirming the internal threat. Vishinsky, examining the corpse, notes the total dehydration and the mystery of how the creature boarded the ship. Professor Sorenson, whose physical and mental state continues to deteriorate with his eyes glowing red, seizes the opportunity to deflect suspicion. He falsely implicates the Doctor and Sarah as alien saboteurs responsible for the deaths, subtly manipulating Salamar's growing paranoia and suggesting their 'machine' (the TARDIS) might hold answers. The crew performs a solemn space burial for Morelli, further highlighting the grim reality of their situation. The Doctor, suspecting contamination, requests a medical check on all crew members, but Salamar, now convinced of the Doctor's culpability, dismisses his concerns. Instead, Salamar confronts the Doctor, accusing him of being responsible for the deaths and threatening to kill him and Sarah if they do not cooperate and allow the TARDIS to be examined. As the ship remains inexplicably stationary, pulled back towards Zeta Minor, the Doctor reiterates his theory about antimatter, but Salamar remains stubbornly incredulous, convinced the Doctor is merely a distraction from his true destructive intentions. This act culminates in a terrifying escalation as Sorenson, succumbing fully to his transformation, brutally kills De Haan, a violent act witnessed by Sarah, confirming the creature's presence and its direct connection to Sorenson.

Act 3

The final act of this segment plunges the Doctor and Sarah into immediate, life-threatening peril. Following the brutal killing of De Haan, Salamar, consumed by grief and a misguided sense of justice, confronts the Doctor in the quarantine area, demanding he open the TARDIS. The Doctor attempts to stall, explaining its external appearance, but Sarah's scream from the corridor—having just witnessed the shadow of Sorenson's monstrous Antiman persona over De Haan's desiccated body—spurs Salamar to action. Misinterpreting the situation, Salamar believes the Doctor is directly responsible for De Haan's death. In a moment of intense desperation and rage, Salamar shoots the Doctor point-blank, severely wounding him. Vishinsky, witnessing the shocking act, attempts to disarm Salamar, but the Controller remains resolute in his conviction that the aliens are the true threat. Declaring his intent to eliminate the perceived danger, Salamar orders his guards to seize the Doctor and Sarah, dragging them towards the ejector chamber—a horrifying fate that would cast them into the vacuum of space. Simultaneously, in his private quarters, Sorenson is seen collapsing onto his bed, his eyes still glowing red, signifying the complete and perhaps irreversible dominance of his Antiman transformation. The segment concludes with the Doctor gravely wounded, Sarah facing imminent execution, and the true antagonist, Sorenson/Antiman, fully unleashed within the ship, leaving the protagonists in a seemingly inescapable trap with their lives hanging precariously in the balance. This climax sets up a desperate struggle for survival against both the creature and the misguided crew.