S4E26
Gritty yet hopeful
Written by Kit Pedler
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The Moonbase Part 4

When Cybermen invade a moonbase and sabotage its weather control, the Doctor and his companions must help the crew regain control and prevent a catastrophic manipulation of Earth's climate, all while desperately awaiting a rescue ship.

The Doctor, along with Polly, Ben, and Jamie, arrive at a moonbase where the crew is under siege by Cybermen. The Cybermen are attempting to take control of the base's weather control unit. The narrative starts with the discovery that Cybermen have tunnelled into the base's storeroom. The Cybermen demand the crew open the entry port, but Hobson, the base commander, refuses, stating they've blocked the Cybermen's passageway.

The Cybermen begin jamming the base's communications with Earth, and then destroy the aerial, cutting them off from help. Although a relief rocket is expected, the Doctor realizes the Cybermen are likely aware of its impending arrival. The Cyberleader confirms this from their spacecraft, and prepares for offensive action to destroy the approaching spaceship from Earth. A Cyberman transmits a control signal, activating Evans, a patient in the sickbay, who is then ordered to change the field coordinates of the gravitron. Back in the control room, Ben is trained to operate a console. Polly brings coffee to the crew, unknowingly passing Evans who is now under Cyberman control. Evans then disables Benson, the operator in the Gravitron Control room, and begins manipulating the controls under the Cybermen's orders.

The relief ship is spotted, but suddenly changes course, heading directly towards the sun due to Evans' manipulation of the gravitron. The Doctor realizes the Cybermen are using the base's own gravitron to deflect the rocket. The crew barricades the medical room to contain others potentially under Cyberman control, The Cybermen, via Evans, threaten to deflect all further ships from Earth and destroy the base. Hobson attempts to reason with Evans, but to no avail. The Cybermen puncture the dome, causing a loss of oxygen in the base. The crew scrambles for oxygen masks and attempts to patch the hole, first with a coat, and finally with a coffee tray. The Doctor, Ben, and Jamie head to the Gravitron Control Room where they subdue Evans and remove the control device.

The Doctor discovers the Cybermen have landed more spaceships and brought up reinforcements with other weapons. The Cyberleader threatens to fire if they don't open the entry port. The Doctor discovers their new weapon deflects off the dome due to the gravitron's force field, which gives him an idea. He instructs Benoit to aim the gravitron at the Cybermen on the lunar surface. They adjust the gravitron manually, managing to direct it at the Cybermen on the surface, causing them and their ships to float away. With the Cybermen defeated, the crew prepares to restore the gravitron to operational status. The Doctor and his companions depart in the TARDIS, witnessing the Cybermen floating away as they leave.


Events in This Episode

The narrative beats that drive the story

42
Act 1

The moonbase crew, under Commander Hobson, faces an immediate Cyberman threat. Cybermen, having tunneled into the base, demand entry, but Hobson refuses, stating the breach is blocked. The Cybermen then jam the base's communications and destroy the aerial, isolating the crew from Earth. Despite this, the crew holds onto hope for an expected relief rocket. The Doctor, however, suspects the Cybermen are aware of the incoming ship. This suspicion is confirmed when the Cyberleader, from a spacecraft, orders the destruction of the approaching vessel. A Cyberman transmits a control signal, activating Evans, a patient in the sickbay. Evans, now under Cyberman control, incapacitates Sam Becket, an attendant, and prepares to follow further instructions. The scene sets the stage for a desperate struggle, establishing the Cybermen's cunning and the moonbase's vulnerability, while introducing the insidious method of internal sabotage through mind control. The crew's initial relief about the relief rocket quickly turns to dread as the Doctor's foresight hints at a deeper, more immediate danger orchestrated by the Cybermen.

Act 2

Evans, now under Cyberman control, infiltrates the Gravitron Control room, incapacitates Benson, and begins manipulating the gravitron's field coordinates as instructed by the Cybermen. The moonbase crew spots the relief ship on the scanner, but it suddenly changes course, accelerating directly towards the sun. The Doctor deduces the Cybermen are using the moonbase's own gravitron to deflect the rocket. Realizing the internal threat, the crew barricades the medical room to contain other potentially controlled individuals. The Cybermen, communicating through Evans, threaten to deflect all future Earth ships and destroy the base. Hobson's attempts to reason with Evans fail. The Cybermen then puncture the dome, causing a rapid loss of oxygen. The crew scrambles for masks and improvises a patch for the hole, first with a coat, then with a coffee tray. The Doctor, Ben, and Jamie move to the Gravitron Control Room, subdue Evans, and remove the control device, temporarily neutralizing the immediate internal threat. This sequence escalates the tension, demonstrating the Cybermen's ruthlessness and the crew's resourcefulness in the face of multiple, compounding crises.

Act 3

Observing the Cybermen's new weapon deflect off the dome due to the gravitron's force field, the Doctor conceives a plan. He instructs Benoit to aim the gravitron at the Cybermen on the lunar surface. Despite initial limitations in the gravitron's aiming mechanism, the crew manually adjusts the probe. As the gravitron's field comes to bear on the surface, the Cybermen and their spaceships begin to float uncontrollably into space, effectively defeated. With the immediate threat neutralized, Hobson directs the crew to restore the gravitron to operational status and re-establish contact with Earth, aiming to have the weather control unit fully functional within two hours. The Doctor, Ben, Polly, and Jamie quietly depart in the TARDIS, witnessing the Cybermen and their ships drifting away as they dematerialize. Inside the TARDIS, the Doctor attempts to use a time scanner, which malfunctions, displaying an image of a giant claw, hinting at a new, unknown danger for the companions. The resolution brings a temporary victory for the moonbase, while simultaneously setting up the next adventure for the Doctor and his companions.