S4E19
Gritty, Defiant
Written by Geoffrey Orme
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The Underwater Menace Part 1

When the TARDIS lands on a volcanic island, the Doctor and his companions find themselves captured by Atlanteans who worship a fish goddess and are caught in the schemes of a scientist who plans to transform humans into fish people.

The Doctor, Polly, Ben, and Jamie arrive via the TARDIS on a volcanic island. Polly, Ben, and Jamie venture up the mountainside while the Doctor examines the beach. Polly spots something moving and the group investigates a nearby cave, where Polly is captured. Ben and Jamie search for her and are captured themselves in a weighted net and dropped into a cage. The Doctor joins them as they descend deep below sea level. They are all rendered unconscious and taken to a chamber.

Upon awakening, they find themselves in what appears to be a compression chamber populated by people from the 1970s. Polly produces a bracelet as proof of what year it is. They are soon confronted by a guard and led to a reception area where a feast is laid out. The Doctor eats heartily while the others hesitate to partake in the plankton-based meal. A priest named Ramo arrives and informs them that their arrival was foretold by the goddess Amdo and that they are to play a part in the upcoming festival of the vernal equinox. The Doctor is separated from his companions and given five minutes to speak with Ramo. He asks about Professor Zaroff, a scientist known for producing food from the sea.

Meanwhile, Polly, Ben, and Jamie are taken to the Temple of Amdo, where they are bound and hoisted onto a platform above a shark-infested well. Ramo begins a sacrificial ritual. Ara, a serving girl, attempts to deliver a message to Professor Zaroff. She speaks with Damon, the Chief Surgeon, who takes the message. Zaroff arrives at the temple and demands to speak with the Doctor, halting the sacrifice. The Doctor reveals he knows of Zaroff's past and his work, and manipulates Zaroff into releasing his companions. They are then taken into Damon's custody.

Ben and Jamie are sent to the mines, while Polly is to be turned into a fish person to work under the sea. Damon shows Polly the underwater farming operation and reveals the plan to give her plastic gills via surgery. The Doctor learns of Polly's impending operation and enlists Ara's help to rescue her. He continues to speak with Zaroff, learning that they are on the ancient kingdom of Atlantis and that Zaroff has promised to lift Atlantis out of the sea. Ara is tasked with getting Polly away from the operation.


Events in This Episode

The narrative beats that drive the story

25
Act 1

The episode opens with the TARDIS materializing, introducing Jamie, a Highlander from 1746, to the Doctor, Polly, and Ben, and the bewildering concept of time travel. Their arrival on a seemingly deserted volcanic island quickly turns ominous as Polly, Ben, and Jamie venture inland, only for Polly to spot a mysterious movement and subsequently be captured in a cave. Her companions, searching for her, fall victim to a weighted net, joining Polly in a metal cage. The Doctor, having investigated strange pottery on the beach, is also captured, completing the quartet's predicament. They endure a terrifying descent deep below sea level, suffering from compressed nitrogen sickness, before awakening in a compression chamber. Here, Polly's discovery of a modern bracelet from the 1970s grounds their temporal displacement. They are soon confronted by guards and led to a reception area where they meet Ramo, a priest who reveals their arrival was foretold by the goddess Amdo. Ramo informs them they are to play a crucial part in the upcoming festival of the vernal equinox, setting a foreboding tone. The Doctor is then separated from his companions, given a mere five minutes to speak with Ramo, during which he shrewdly inquires about Professor Zaroff, a scientist known for pioneering sea-based food production. This act establishes the core characters, introduces the mysterious setting, and plunges the protagonists into immediate peril, culminating in their separation and the ominous prophecy.

Act 2

Following their separation, Polly, Ben, and Jamie are dragged to the cavernous Temple of Amdo, a sacred space dominated by a fish-woman idol. Bound hand and foot, they are hoisted onto a platform situated precariously above a well teeming with sharks, as Ramo prepares to commence a sacrificial ritual. Simultaneously, Ara, a sympathetic serving girl, attempts to deliver a message from the Doctor to Professor Zaroff, but the note is intercepted by Damon, the Chief Surgeon. Just as the water-filled jars, acting as counterweights, begin to drain, slowly tilting the platform towards the shark-infested abyss, Zaroff dramatically intervenes, halting the sacrifice. He demands to speak with the Doctor, who, having been brought to the temple, cleverly manipulates Zaroff by feigning knowledge of a “vital secret.” The Doctor insists on his companions’ release as a condition for sharing this information. Zaroff, intrigued, concedes, and the companions are taken into Damon’s custody. This reprieve is short-lived, however, as Ben and Jamie are summarily dispatched to the mines. Polly faces a far more chilling fate: Damon reveals the underwater farming operation and the plan to give her “plastic gills” via surgery, effectively transforming her into a fish person to work beneath the sea. This act escalates the peril from immediate sacrifice to a more insidious threat of bodily alteration and enslavement, deepening the antagonists’ sinister plans.

Act 3

As Polly grapples with the horrifying prospect of her impending transformation, the Doctor continues his strategic conversation with Professor Zaroff. During this exchange, the Doctor astutely deduces that they are in fact on the ancient, legendary kingdom of Atlantis. Zaroff confirms this, further revealing his ambitious, almost megalomaniacal, promise to the Atlanteans: to lift their entire city out of the sea. This grand, impossible scheme underscores Zaroff’s scientific genius and his capacity for manipulation, as he has used this promise to gain the trust and cooperation of the Atlantean populace, despite their adherence to ancient rituals and idol worship. The Doctor, ever the pragmatist, questions the compatibility of science with their deeply ingrained traditions, highlighting the tension between Zaroff’s modern ambitions and the Atlanteans’ archaic beliefs. The narrative’s focus sharpens when Ara, the serving girl, urgently informs the Doctor about Polly’s imminent “fish operation.” This news galvanizes the Doctor into immediate action. Recognizing the dire threat to Polly, he quickly enlists Ara’s help, tasking her with finding an opportunity to get Polly away from the operating theatre. This act pivots from the general threat of capture and sacrifice to a specific, urgent rescue mission, while simultaneously broadening the scope of the conflict by revealing the true nature of their location and the antagonist’s overarching, world-altering agenda. The episode concludes with the Doctor actively working to save Polly and unravel Zaroff’s grand, perilous plan.