S6E16
Tragic (with undercurrents of hard-won hope)
Written by Derrick Sherwin
Story by Kit Pedler
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The Invasion Part 6

As Cybermen invade London, the Doctor, UNIT, and his companions desperately seek a way to counteract the Cybermen's control signal before it enslaves humanity, while a sinister businessman, Vaughn, plans to double-cross the Cybermen.

In "The Invasion - Episode Six", the Cybermen's plan to conquer Earth moves closer to fruition as UNIT discovers their forces are already active in the sewers. Captain Turner and his troops confront and destroy some Cybermen, but their mission reveals the scale of the threat leading to alerts to the Brigadier. Simultaneously, the Doctor works tirelessly in a laboratory, attempting to decipher the Cybermen's technology, while Professor Watkins is forced to modify the Cerebraton Mentor machine for Vaughn's sinister purposes.

Vaughn, an enigmatic figure, collaborates with the Cybermen, but his true agenda involves exploiting their invasion for his personal gain. He aims to weaponize the Cerebraton machine against the Cybermen themselves. The ruthless nature of Vaughn comes to the fore when he tests the machine on Professor Watkins, showcasing its destructive potential and his unyielding ambition.

As the Cybermen prepare to transmit a signal that will bring humanity under their control, the Doctor uncovers that the Cybermen plan to use communication satellites. He tasks Zoe and Professor Watkins with constructing devices to block the signal's effects. The episode culminates with the Cybermen setting their plan into motion, poised to trigger the global invasion and bring humanity to heel. The Doctor and his allies have minutes to make and deploy depolarizers to counteract the Cyber-hypnotic force before it enslaves the entire planet. The final shot shows the normalcy of London as the invasion unfolds, creating a stark contrast between the peaceful exterior and the impending doom.


Events in This Episode

The narrative beats that drive the story

19
Act 1

The episode opens with UNIT forces, led by Captain Turner, descending into London's sewers to confront the Cybermen. This initial engagement immediately establishes the Cybermen as a formidable and resilient threat, as soldiers struggle to contain them even with grenades. Private Perkins falls victim to a Cyberman's chest unit, underscoring the lethal danger. Meanwhile, Jamie, Zoe, and Isobel navigate the labyrinthine tunnels, narrowly avoiding a "demented" Cyberman, further highlighting the chaos and unpredictability of the invasion's early stages. Above ground, the Doctor toils in a laboratory, attempting to decipher the alien logic of Cyberman circuits, but without immediate success. Brigadier Lethbridge-Stewart prepares to brief UNIT Central Command in Geneva, but Isobel's photographic evidence of the Cybermen appears blurred and unconvincing, suggesting the difficulty of mobilizing official support against such an unbelievable threat. Concurrently, the sinister businessman Vaughn reveals his own agenda. He dismisses UNIT's efforts, confident in the Cybermen's imminent success. Vaughn compels Professor Watkins to modify the Cerebraton Mentor machine, transforming it into a weapon. Vaughn sadistically tests the machine on Watkins, demonstrating its destructive power and his own ruthless ambition. Watkins, though forced to comply, openly defies Vaughn, even attempting to "shoot" him, only for Vaughn to reveal his imperviousness and mock the Professor's futile resistance. This act sets the stage by showcasing the immediate, physical invasion, the initial struggles of the heroes, and the introduction of Vaughn's complex, self-serving plot that intertwines with the Cybermen's larger scheme.

Act 2

Following the initial confrontations, the narrative shifts as UNIT takes decisive action. Captain Turner receives intelligence from Benton, who tracks Professor Watkins after his encounter with Vaughn. Despite initial bureaucratic hesitation, the Brigadier authorizes a full assault platoon to rescue Watkins, recognizing the Professor's potential value in understanding the unfolding crisis. UNIT successfully extracts Watkins from Vaughn's control, demonstrating their operational capability. However, Vaughn's associate, Gregory, who reported the rescue, is subsequently hunted down and killed by Cybermen in the sewers, illustrating the Cybermen's pervasive presence and Vaughn's precarious position even within his own alliance. Back in the laboratory, the Doctor, now with Watkins's input, experiences a profound breakthrough. He deduces that the micro-monolithic circuits are not logical but emotional, and that Vaughn intends to weaponize the Cerebraton machine against the Cybermen themselves, exploiting their vulnerability to emotion. The Doctor then reveals the Cybermen's overarching invasion strategy: they will use communication satellites to boost a global Cyber-hypnotic signal, activating these emotional circuits within everyday IE equipment, thereby enslaving humanity. Zoe identifies a potential countermeasure: a depolarizer, worn at the back of the neck, capable of jamming these control waves. The Doctor immediately tasks Zoe and Watkins with constructing these vital devices, initiating a desperate race against time as the full scope of the global threat becomes terrifyingly clear.

Act 3

The final act plunges the protagonists into a desperate race against the clock as the Cybermen's invasion plan accelerates. A Cyberman "Planner" communicates with Vaughn, initiating a one-hour countdown to the global transmission of the Cyber-signal. The Doctor urgently relays the critical need for depolarizers to the Brigadier, who promises to mobilize UNIT groups for deployment. However, the immediate challenge becomes apparent in the laboratory: Zoe and Watkins have only managed to construct three depolarizers due to a critical shortage of neuristors. This revelation escalates the stakes significantly, as the Doctor, Jamie, Zoe, and Isobel frantically search for more components, understanding they must at least protect themselves and those immediately present. Vaughn, meanwhile, remains oblivious to the Doctor's counter-strategy, confidently asserting to Packer that he will soon control the world, believing his double-cross of the Cybermen is secure. As dawn breaks over London, Isobel and Captain Turner observe the city's tranquil beauty, a stark and poignant contrast to the impending global catastrophe. Their conversation highlights the disbelief and difficulty in comprehending such an unimaginable threat against a backdrop of normalcy. The electronic sound of the Cyber-signal then begins, marking the commencement of the global invasion and leaving the fate of humanity hanging precariously in the balance, with only minutes remaining for the Doctor and his allies to deploy their limited defenses.