Doctor reverses tunnel to trap the Nimons

The Doctor flips the space-time tunnel’s flow, sending the escaping Nimons’ vessel back into the void before they can detonate their planet-killing payload. Though cornered by Soldeed’s forces, Romana and Seth hold off the Nimons long enough for the Doctor to seize control. With K9’s help, the tunnel is diverted—creating a collapsing transdimensional trap that rips the parasites from Crinoth. The Doctor’s gambit not only stops a planetary meltdown but also severs the cosmic chain reaction threatening the universe.

Plot Beats

The narrative micro-steps within this event

2

The Doctor thwarts the Nimons' plan by reversing the flow of the tunnel, and the capsule disappears from Crinoth.

relief to tension ["Nimon's laboratory"]

The Doctor tasks K9 with modifying the controls to divert the space-time tunnel.

caution to hope ["Nimon's laboratory"]

Who Was There

Characters present in this moment

6

Focused intensity masked by self-assured banter, believing the critical moment demands both speed and strategy

The Doctor rapidly actuates the gravitic anomaliser while articulating his plan aloud, reversing the space-time tunnel’s flow to eject the Nimons’ vessel just as they attempt to deploy their planet-killing payload. He commands K9 to modify controls, seizes physical leverage to lock the tunnel, and expresses confidence in their salvation with dry wit.

Goals in this moment
  • To reverse the space-time tunnel’s flow and eject the escaping Nimons’ vessel before detonation
  • To permanently lock off the tunnel to prevent the cosmic chain reaction
Active beliefs
  • Physical science and alien technology can be physically overridden with sufficient knowledge
  • Every second counts in preventing universal catastrophe
Character traits
Technical improvisation under pressure Vocally assertive leadership Adaptable problem-solving Dry, conversational wit Unflappable confidence
Follow The Fourth …'s journey

Calculating and dutiful, masked by procedurally flat communications

K9 arrives in response to the Doctor’s call, finds the tardy unit despite being immobilized earlier, and immediately connects to the gravitic anomaliser. The robot follows the Doctor’s precise instructions to modify the tunnel controls, diverting the space-time tunnel into a collapsing trap that rips the Nimons from Crinoth.

Goals in this moment
  • To comply with the Doctor’s directive and modify the tunnel controls
  • To assist in stabilizing the immediate crisis
Active beliefs
  • Technical services must be rendered regardless of temporal delays
  • Master’s guidance supersedes all tactical uncertainties
Character traits
Functionally precise technical execution Unwavering obedience to the Doctor’s commands Physical adaptability despite prior damage Efficient reconfiguration of alien systems
Follow K9's journey

Urgently focused with flashes of alarm when cornered briefly by hostile Nimons

Romana spots the Nimon’s lever operation, immediately comprehends the Doctor’s intent, and rushes to Seth’s aid. She tosses the Jasonite into his hands with precise timing, instructing him urgently how to wield it to disable the attacking Nimons.

Goals in this moment
  • To prevent Romana from being harmed by Soldeed’s forces
  • To neutralize the immediate Nimons threatening the Doctor and allies
Active beliefs
  • Collaboration with unlikely allies can produce critical solutions
  • Direct intervention is necessary when conventional routes are blocked
Character traits
Quick tactical thinking Leading by decisive action Clear communication under duress Resourcefulness in crisis Protective instinct toward allies
Follow Romana's journey
Supporting 3
Nimon
secondary

Aggressive opportunism, exploiting openings with predatory efficiency

A third Nimon materializes during the confrontation, using a pulse weapon to disable Seth’s staff and shooting a laser that strikes Seth down from behind. Romana calls out in alarm as the Nimon is immediately terminated by an unseen assailant.

Goals in this moment
  • To eliminate Seth and seize tactical advantage
  • To reassert control over the weapon channelled to Seth
Active beliefs
  • All resistance must be crushed immediately
  • Loss of control over allies is intolerable
Character traits
Sudden opportunistic violence Fluid repositioning in combat Systemic enforcement of Nimon authority Tactical precision in ambush
Follow Nimon's journey
Nimon 2
secondary

Aggressively hostile, perceiving rebellion as a mortal threat requiring immediate reprisal

Nimon 2 commands the lever controlling the tunnel flow, ordering the Doctor to reverse the reversal. He attempts to strike the Doctor while demanding restoration of the Nimons’ escape route, revealing his role as a direct enforcer of Nimon will.

Goals in this moment
  • To force the Doctor to restore the original tunnel direction
  • To eliminate Romana as an obstacle to Nimon operations
Active beliefs
  • Defiance of the Nimon order is punishable by death
  • Absolute control must be reasserted without hesitation
Character traits
Arrogant hostility Authoritarian control Violent aggression Operational enforcement
Follow Nimon 2's journey

Confused but galvanized into purpose by loss and the need for quick action

Seth bursts in bearing the modified Soldeed staff, visibly disoriented yet determined. He stumbles through Romana’s instructions, hesitates, then fires—unintentionally disabling both Nimons. He regains brief composure only to announce Teka’s loss, expressing confusion about the unfolding crisis.

Goals in this moment
  • To rescue Romana from immediate threat
  • To assist the Doctor by wielding the Jasonite-enhanced staff effectively
Active beliefs
  • Even without full understanding, acting loyally can help others
  • Soldeed’s weapons, when repurposed, can serve good ends
Character traits
Reluctant heroism under pressure Physical bravery despite mental confusion Loyalty to Teka driving action Initial hesitation followed by decisive action Pragmatic followership
Follow Seth of …'s journey

Objects Involved

Significant items in this scene

8
Gravitic Anomaliser

The gravitic anomaliser forms the core control mechanism for the space-time tunnel. K9 interfaces directly with its systems to divert the tunnel’s flow into a collapsing trap, reversing its destructive path and ripping the Nimons from Crinoth’s grasp.

Before: Accessible and responsive to the Doctor’s urgent recalibration …
After: Modified under K9’s command, now redirecting the collapsing …
Before: Accessible and responsive to the Doctor’s urgent recalibration efforts
After: Modified under K9’s command, now redirecting the collapsing tunnel energy
Temporal Link Stabilizer Lever

The lever controlling the space-time tunnel’s directional flow is physically operated by Nimon 2 as part of his demand that the Doctor restore the original flow. His manipulation of the lever triggers the Doctor’s rapid response and the reversal of the tunnel’s orientation.

Before: Fully inserted and under Nimon 2’s control in …
After: Lever overridden by the Doctor’s counter-moves, tunnel direction …
Before: Fully inserted and under Nimon 2’s control in the Nimon laboratory
After: Lever overridden by the Doctor’s counter-moves, tunnel direction permanently altered
Romana's Space Capsule

The Nimons’ vessel carrying the escaping Nimons is visibly torn from Crinoth’s orbital space by the Doctor’s reversal of the tunnel’s gravitational flow—halting their plan to detonate the payload. The vessel disappears into the void, no longer a threat.

Before: Escaping Nimons’ vessel preparing to activate planet-killing payload …
After: Vessel ripped from local spacetime and sent adrift …
Before: Escaping Nimons’ vessel preparing to activate planet-killing payload on Crinoth
After: Vessel ripped from local spacetime and sent adrift in the void, payload disarmed
Crashing Space-Time Tunnel

The crashing space-time tunnel pivots from a catastrophic escape route into a collapsing trap under the Doctor’s direction and K9’s modification. Its distorted spacetime begins to tear the Nimons from Crinoth while threatening structural implosion.

Before: Stable, serving as Nimon escape conduit from Crinoth
After: Collapsing and unstable, ripping parasites from the planet’s …
Before: Stable, serving as Nimon escape conduit from Crinoth
After: Collapsing and unstable, ripping parasites from the planet’s dimensional grip
Gravitic Anomaly Generator

The gravitic anomaly generator powers the space-time tunnel and becomes the focal point of the Doctor’s gambit. He physically engages with it, reversing its field direction to lock off the tunnel permanently, severing the cosmic chain reaction.

Before: Housed within the Nimon laboratory’s command complex, humming …
After: Physically overridden, its orientation reversed to collapse the …
Before: Housed within the Nimon laboratory’s command complex, humming with alien energy
After: Physically overridden, its orientation reversed to collapse the tunnel
The Jasonite

The Jasonite device is tossed by Romana into Seth’s hands mid-crisis. When jammed between the prongs of the staff and fired, the Jasonite’s energy disables two Nimons. Its alien interface momentarily resists human handling, but ultimately channels the critical disabling pulse.

Before: In Romana’s brief possession, energized and ready for …
After: Spent after discharging its stored energy through the …
Before: In Romana’s brief possession, energized and ready for field deployment
After: Spent after discharging its stored energy through the staff
Sezom's Modified Jasonite Staff (with Diamond Focus Crystal)

Soldeed’s modified staff, augmented by Jasonite energy via Romana’s toss, becomes a weapon against the Nimons. After Seth hesitates and follows Romana’s instructions, firing the staff discharges the Jasonite charge, paralyzing two Nimons despite his confusion.

Before: Modified staff in Seth’s possession, powered by Teka’s …
After: Staff discharged and briefly inert after the Jasonite …
Before: Modified staff in Seth’s possession, powered by Teka’s guidance
After: Staff discharged and briefly inert after the Jasonite energy release
Soldeed’s Ritual Staff

Soldeed’s Ritual Staff, temporarily modified with Jasonite energy, becomes a conduit for the disabling pulse that neutralizes two Nimons. Though Seth grasps it in confusion, the fusion of alien staff and Jasonite weaponry produces the critical tactical turn.

Before: In Seth’s hands, freshly charged with Jasonite energy …
After: Temporarily inert due to energy discharge, its crystalline …
Before: In Seth’s hands, freshly charged with Jasonite energy from Romana
After: Temporarily inert due to energy discharge, its crystalline components scintillating

Location Details

Places and their significance in this event

1
Nimon's Laboratory

Nimon’s Laboratory serves as the control centre where the space-time tunnel is diverted and locked off. The Doctor races across and around its consoles to modify the gravitic anomaliser, while Romana and Seth defend the doorway from Nimons attempting to stop the reversal.

Atmosphere Charged with urgent electrical hum and glowing alien glyphs, the air thick with ozone and …
Function Primary command and control nexus for the climax of the tunnel diversion
Symbolism A false sanctuary turned battlefield—technology intended for domination repurposed to prevent annihilation
Access Controlled by Nimon forces but breached by Romana and Seth in desperate intervention
Harsh angular light from flickering consoles casting jagged shadows Compact command complex with the gravitic anomaliser and tunnel control at its heart

Organizations Involved

Institutional presence and influence

1
The Nimon

The Nimon organization’s physical and technological presence dominates the laboratory, represented by Nimon 2 operating the space-time tunnel lever and commanding immediate lethal enforcement. Their system of tribute and energy conversion converges at the gravitic anomaliser, whose override by the Doctor severs their dimensional expansion.

Representation Enforced through Nimon 2’s direct operation of key controls and immediate violence against intruders
Power Dynamics The Nimons exercise coercive authority through technology and terror, but are superseded when their systems …
Impact Their near-success demonstrates the fragility of the Nimon empire when confronted with superior tactical adaptation, …
To complete the escape of their species via the space-time tunnel To eliminate all resistance preventing their departure Technology-based control leveraging raw spacetime manipulation Fear-based enforcement through immediate, visceral violence

Narrative Connections

How this event relates to others in the story

What led here 9

"The Doctor tasking K9 with modifying the controls to divert the space-time tunnel directly leads to K9's successful intervention, reversing the flow and sending the capsule (and thus the threat) away. This action is the primary solution to the Nimon invasion."

Doctor locks portal as planet teeters
S17E20 · The Horns of Nimon Part …

"K9's insistence on being removed from the surface and his escape to the Doctor directly leads to his assignment to modify the space-time tunnel controls. This continuity shows the direct impact of K9's growing independence."

Sorak trapped behind sealed doors
S17E20 · The Horns of Nimon Part …

"Romana's request for Jasonite modification of the staff causes Seth's later success in stunning the Nimons. This direct link shows how Romana's actions equip the team to combat the immediate threat."

Nimons activate doomsday gambit
S17E20 · The Horns of Nimon Part …

"Romana's request for Jasonite modification of the staff causes Seth's later success in stunning the Nimons. This direct link shows how Romana's actions equip the team to combat the immediate threat."

Romana and Sezom face the parasite’s peril
S17E20 · The Horns of Nimon Part …

"Romana's request for Jasonite modification of the staff causes Seth's later success in stunning the Nimons. This direct link shows how Romana's actions equip the team to combat the immediate threat."

Romana seizes Sezom's weapon for the mission
S17E20 · The Horns of Nimon Part …

"The Doctor tasking K9 with modifying the controls to divert the space-time tunnel directly leads to K9's successful intervention, reversing the flow and sending the capsule (and thus the threat) away. This action is the primary solution to the Nimon invasion."

Seth joins Romana to strike against Nimons
S17E20 · The Horns of Nimon Part …

"K9's insistence on being removed from the surface and his escape to the Doctor directly leads to his assignment to modify the space-time tunnel controls. This continuity shows the direct impact of K9's growing independence."

K9 asserts independence in lab
S17E20 · The Horns of Nimon Part …

"The immediate success of stunning the Nimons is followed by the Doctor tasking K9 with modifying the controls to divert the space-time tunnel. This escalation raises the stakes from merely defeating the Nimons to preventing a chain reaction that could destroy Crinoth."

Seth joins Romana to strike against Nimons
S17E20 · The Horns of Nimon Part …

"The immediate success of stunning the Nimons is followed by the Doctor tasking K9 with modifying the controls to divert the space-time tunnel. This escalation raises the stakes from merely defeating the Nimons to preventing a chain reaction that could destroy Crinoth."

Doctor locks portal as planet teeters
S17E20 · The Horns of Nimon Part …
What this causes 5

"The Doctor tasking K9 with modifying the controls to divert the space-time tunnel directly leads to K9's successful intervention, reversing the flow and sending the capsule (and thus the threat) away. This action is the primary solution to the Nimon invasion."

Seth joins Romana to strike against Nimons
S17E20 · The Horns of Nimon Part …

"The Doctor tasking K9 with modifying the controls to divert the space-time tunnel directly leads to K9's successful intervention, reversing the flow and sending the capsule (and thus the threat) away. This action is the primary solution to the Nimon invasion."

Doctor locks portal as planet teeters
S17E20 · The Horns of Nimon Part …

"Soldeed's activation of the nuclear furnace directly causes the furnace to go critical, trapping Teka and the Anethans and putting Crinoth on the brink of destruction. This sudden escalation from invasion prevention to planetary evacuation is a pivotal turning point."

Sabotage triggers reactor meltdown
S17E20 · The Horns of Nimon Part …

"The immediate success of stunning the Nimons is followed by the Doctor tasking K9 with modifying the controls to divert the space-time tunnel. This escalation raises the stakes from merely defeating the Nimons to preventing a chain reaction that could destroy Crinoth."

Seth joins Romana to strike against Nimons
S17E20 · The Horns of Nimon Part …

"The immediate success of stunning the Nimons is followed by the Doctor tasking K9 with modifying the controls to divert the space-time tunnel. This escalation raises the stakes from merely defeating the Nimons to preventing a chain reaction that could destroy Crinoth."

Doctor locks portal as planet teeters
S17E20 · The Horns of Nimon Part …

Themes This Exemplifies

Thematic resonance and meaning

Key Dialogue

"DOCTOR: Thank you."
"SETH: What?"
"ROMANA: Shoot!"