S2E17 · The Zarbi graph
S2E17
· The Zarbi

Barbara betrays Menoptra under Zarbi control

Under the Zarbi’s mind-control influence, Barbara—once a trusted ally—leads the insectile invaders directly to the Menoptra’s hidden cave stronghold. Her movements are mechanical, her expression blank, as she navigates the terrain with eerie precision, guided by the Zarbi’s silent commands. The betrayal is not malicious but forced, a tragic consequence of her captivity. The Menoptra’s last refuge is exposed, their defenses compromised, and the Zarbi’s relentless advance now has a clear path to annihilation. This moment escalates the conflict from skirmish to all-out war, forcing the Doctor and his companions into a desperate race to counter the Zarbi’s assault before the Menoptra are wiped out. The scene underscores the Zarbi’s tactical brilliance and the cost of Barbara’s involuntary role in their victory.

Plot Beats

The narrative micro-steps within this event

1

Under the Zarbi's control, Barbara leads the Zarbi directly to the Menoptra's hidden cave.

Defiance to invasion

Who Was There

Characters present in this moment

2

Detached and hollow, her internal self suppressed by the Zarbi’s mind-control. Surface-level calm masks the horror of her involuntary betrayal, her true emotions buried beneath the Zarbi’s dominance.

Barbara moves mechanically across the barren planet surface, her expression blank and her will subsumed by the Zarbi’s mind-control. She leads the insectile invaders directly to the Menoptra’s hidden cave stronghold, her actions guided by silent, unseen commands. Her posture is rigid, her steps precise, and her eyes devoid of recognition—she is a puppet in the Zarbi’s hive-mind scheme, her humanity temporarily erased by their control.

Goals in this moment
  • Unwittingly guide the Zarbi to the Menoptra’s hideout (forced by mind-control)
  • Survive the Zarbi’s influence without conscious resistance (due to lack of agency)
Active beliefs
  • She is acting of her own free will (a false belief implanted by the Zarbi)
  • The Menoptra’s hideout is a safe location (misled by the Zarbi’s control)
Character traits
Mechanical compliance Emotionally detached Physically rigid Unwitting traitor Vulnerable to external control
Follow Barbara Wright's journey
Zarbi
primary

Cold and calculating, driven by the singular purpose of expanding their control. There is no remorse or hesitation—only the ruthless efficiency of a collective intelligence bent on domination.

The Zarbi loom behind Barbara, their mandibles clicking in silent coordination as they use her as a living compass. Their presence is oppressive, their movements synchronized and relentless. They do not speak but exert their will through sheer dominance, their hive-mind intelligence guiding Barbara’s steps toward the Menoptra’s hideout. Their goal is clear: locate and crush the resistance, and Barbara—though unwilling—is their key to victory.

Goals in this moment
  • Locate and expose the Menoptra’s hidden cave stronghold using Barbara as a guide
  • Crush the Menoptra resistance to secure total control over the planet
Active beliefs
  • The Menoptra are the last obstacle to their dominance and must be eradicated
  • Mind-control is an effective tool for turning enemies into unwitting allies
Character traits
Hive-mind coordination Tactically brilliant Relentless and dominant Silent but commanding Exploitative of weakness
Follow Zarbi's journey

Location Details

Places and their significance in this event

1
Vortis

The barren planet surface serves as the pathway for Barbara’s forced march toward the Menoptra’s hideout. The terrain is harsh and unforgiving, scarred by drag tracks where the Zarbi seized the TARDIS. The toxic atmosphere hangs heavy, a constant reminder of the planet’s hostility. Here, Barbara’s betrayal unfolds in the open, her mechanical steps echoing across the desolate landscape as the Zarbi close in on their prey. The location is both a battleground and a witness to the tragedy of her involuntary role in the Zarbi’s victory.

Atmosphere Oppressive and desolate, with a sense of impending doom. The silence is broken only by …
Function Pathway to the Menoptra’s hideout and stage for Barbara’s involuntary betrayal. The barren surface forces …
Symbolism Represents the inevitability of the Zarbi’s advance and the cost of resistance. The emptiness of …
Access Open but hostile; the toxic atmosphere and Zarbi presence make it a deadly terrain for …
Scarred by drag tracks from the Zarbi’s seizure of the TARDIS Toxic atmosphere that corrodes protective gear Eerie silence broken only by the Zarbi’s mandibles and Barbara’s footsteps

Organizations Involved

Institutional presence and influence

2
Zarbi

The Zarbi organization manifests through their collective dominance over Barbara, using her as a living tool to locate and expose the Menoptra’s hideout. Their hive-mind intelligence coordinates her movements with precision, ensuring the resistance’s last refuge is compromised. This event is a microcosm of their broader strategy: exploit weaknesses, turn enemies into assets, and crush all opposition. The Zarbi’s power dynamics here are unchallenged—they dictate the terms of the conflict, and Barbara’s involuntary compliance underscores their ability to manipulate even the most resilient individuals.

Representation Via collective action of members (the Zarbi) and the exploitation of a mind-controlled asset (Barbara).
Power Dynamics Exercising absolute authority over Barbara and the Menoptra, operating with impunity. Their influence is unchecked, …
Impact Reinforces the Zarbi’s dominance over the planet, proving their ability to manipulate even the most …
Internal Dynamics None evident in this event; the Zarbi operate as a unified, relentless force with no …
Locate and destroy the Menoptra’s hidden cave stronghold to eliminate resistance Demonstrate the effectiveness of mind-control as a tool for turning enemies into unwitting allies Mind-control devices (gold bracelets/metal bands) to subvert Barbara’s will Hive-mind coordination to exploit her knowledge of the Menoptra’s location
Menoptra

The Menoptra resistance is indirectly but critically affected by this event, as their hidden cave stronghold is exposed due to Barbara’s forced betrayal. Though not physically present, their fate hangs in the balance—their last refuge is now a target, and their survival depends on the Doctor and his companions intervening before the Zarbi’s assault. The organization’s vulnerability is laid bare, and their struggle against the Zarbi’s domination reaches a tipping point. This moment forces them into a desperate defensive stance, with their very existence at stake.

Representation Via the impending threat to their hideout and the exposure of their location by Barbara.
Power Dynamics Being challenged by external forces (the Zarbi) and vulnerable to betrayal (Barbara’s mind-controlled guidance). Their …
Impact Highlights the Menoptra’s precarious position as the underdog in this conflict, with their survival hinging …
Internal Dynamics Likely internal urgency and debate over how to respond to the Zarbi’s advance, with factions …
Survive the Zarbi’s impending assault on their hideout Rally remaining forces to defend their last refuge against the Zarbi’s advance Dependence on the Doctor and his companions for intervention Internal coordination to fortify their hideout against the Zarbi’s attack

Narrative Connections

How this event relates to others in the story

Within this episode

What led here 1

"The Menoptra's attempts to broadcast a warning are related to Barbara leading the Zarbi to their cave. The Menoptra are afraid of the Zarbi discovering their location, which comes true when Barbara leads them directly to it."

Vrestin risks exposure to contact Menoptra
S2E17 · The Zarbi
What this causes 1

"Barbara's captivity and mind control directly enable the Zarbi to attack the Menoptra's cave."

Hrhoonda’s Last Stand and the Cave’s Collapse
S2E17 · The Zarbi

Across episodes

Threads arriving here 4
Causal medium

"The Doctor's manipulation of Vicki in Episode 11, using emotional vulnerability to isolate and control her, foreshadows the Zarbi's use of mind control to turn Barbara into a weapon against her allies in Episode 17."

Doctor manipulates Vicki into betraying Bennett
S2E11 · Desperate Measures

"Barbara's emotional devastation after inadvertently killing Sandy and the Doctor's manipulation leaves her psychologically exposed. This vulnerability makes her susceptible to the Zarbi's mind-control in Episode 17, where she literally becomes an instrument of harm against others (Menoptra)."

Doctor manipulates Vicki into betraying Bennett
S2E11 · Desperate Measures

"Ian’s ensnarement by an alien trap in Episode 16 escalates to Barbara’s betrayal under Zarbi mind control in Episode 17, showing how the planet’s threats increase in sophistication and danger."

Ian trapped in alien snare
S2E16 · The Web Planet

"The Doctor's manipulation of Vicki's trust in Episode 11 escalates into the Zarbi's complete psychological control of Barbara in Episode 17."

Doctor manipulates Vicki into betraying Bennett
S2E11 · Desperate Measures
Threads leading onward 7

"Barbara's betrayal while under Zarbi mind-control (E17, leading the Zarbi to the Menoptra cave) is explicitly referenced by the Animus in E18 when it identifies Barbara's location (Crater of Needles) as part of the Zarbi's intelligence. The Animus’s knowledge confirms the betrayal’s reality and consequence."

Doctor bargains with Animus for Barbara's location
S2E18 · Escape to Danger

"Barbara's betrayal under Zarbi control (E17) directly motivates the Doctor's urgent mission to rescue her (E18), demonstrating how her victimization drives group actions."

Doctor dispatches Ian to rescue Barbara
S2E18 · Escape to Danger

"Barbara's experience of mind control under the Zarbi in Episode 17 foreshadows her disorientation and confusion in Episode 26, where she struggles to process temporal displacement and the Doctor's evasiveness."

Doctor dismisses clothing mystery with evasion
S2E26 · The Space Museum

"Barbara's betrayal under Zarbi control foreshadows her later disorientation and horror when realizing she is a 'ghost' in the museum exhibit."

The Doctor explains the fourth dimension trap
S2E26 · The Space Museum

"Barbara's loss of bodily autonomy under Zarbi control (Episode 17) escalates into the crew's loss of temporal autonomy through clothing shifts and TARDIS exhibit discovery (Episode 26). Both events strip away personal identity and agency in incomprehensible ways."

Temporal displacement confirmed through clothing shift
S2E26 · The Space Museum

"Both episodes explore Barbara's loss of control—physically under the Zarbi's mind control (Episode 17) and existentially in the Space Museum's temporal trap (Episode 26)."

The Doctor explains the fourth dimension trap
S2E26 · The Space Museum

"Barbara's betrayal under mind control parallels the Doctor's feigned cooperation with the Animus to manipulate the Zarbi."

Menoptra transmission reveals invasion and Barbara’s location
S2E18 · Escape to Danger

Themes This Exemplifies

Thematic resonance and meaning

Part of Larger Arcs

Key Dialogue

"BARBARA: (monotone, hollow) "This way. The cave is here.""
"ZARBI COMMANDER: (hissing, guttural) "The resistance falls. The hive expands.""