The Krynoid Threat
An alien pod in Antarctica mutates a biologist into a Krynoid, spreading biological contamination. As the organism escalates its threat, Harrison Chase obsessively preserves it, conducting experiments that culminate in catastrophic plant overgrowth, forcing the Doctor to stop the ecological disaster.
Involved Characters
Arc Timeline
Season 11
3 eventsPhillips bursts into the deserted jeweller’s shop, a twitching sawn-off shotgun in hand, his desperation couched in territorial threats. His demand for the Doctor and Sarah to stand against the …
The fragile sanctuary of the jeweller’s shop shatters when desperate looter Phillips brandishes a shotgun and forces the Doctor and Sarah against the wall. His erratic flight from the scene …
The Doctor and Sarah investigate a deserted jeweler's shop where they find Phillips looting, only for him to flee in terror. Moments later they hear screeching tires and a deep …
Season 13
28 eventsMaren confronts the bound Doctor in the Sisterhood’s shrine, accusing him of being a Time Lord spy dispatched to steal the Elixir of Life. The interrogation quickly escalates as Maren …
As the Sisterhood prepares to sacrifice the Doctor to the Sacred Flame, Ohica reveals the Elixir can no longer form, rendering their rituals meaningless and exposing their desperation. Maren insists …
Two Antarctic researchers break protocol to gather samples at the base of a glacier, only to uncover an ice-encased artifact of unknown biology. Winlett immediately senses its unnatural origins while …
Dunbar arrives at Chase’s mansion with a stolen secret—photographs of an ancient, potentially extraterrestrial plant pod recently unearthed in Antarctica. Presenting it as a rare scientific specimen with global significance, …
With the Antarctic pod’s infection rapidly consuming Winlett and Thackeray’s telex confirming the crisis has overwhelmed local resources, Dunbar grasps for an institutional solution. His insistence on involving UNIT introduces …
Stevenson and the Doctor examine Winlett in sickbay, where his body temperature and pulse plummet despite him remaining conscious. The Doctor reveals Winlett’s condition is worsening as green tendrils overtake …
Moberley reluctantly agrees to perform a desperate amputation on Winlett’s grotesquely transformed body, believing the limb to be the source of the spreading infection. As the team rushes to prepare …
Keeler examines the alien pod through a magnifying lens and notices abnormal biological growth on its surface. Realizing the perilous danger, he abandons scientific detachment and urgently orders Hargreaves to …
Against Keeler’s explicit warnings, Chase overrides all safety protocols to order a nitrogen injection into the sealed pod. His obsession with unlocking the alien artifact’s secrets overrides caution and ethical …
In Keeler’s isolated lab, the pod’s expansion reveals grotesque vitality through widening seams and shifting angles. Keeler cowers in terror as the pod’s accelerating transformation horrifies him, its very form …
In a frantic escape, the Doctor leaps through the skylight into Keeler's lab and immediately incapacitates Scorby with brutal efficiency. Grabbing Sarah, he seizes control of a gun and disarms …
As the Doctor and Sarah make their daring escape from Chase’s lab, the Krynoid tendril lashes out violently in its containment, seeking any living tissue to consume. It latches onto …
Chase observes Keeler’s grotesque transformation into a plant-like organism with clinical detachment, dismissing urgent pleas for medical intervention with cold rationality. As Keeler’s skin turns green and his limbs spasm …
Hargreaves expresses grave misgivings to Chase outside the cottage as they oversee the Doctor’s containment in the pod. His warning about the potential danger posed by the prisoner goes unheeded …
Chase’s estate teeters on chaos as Scorby triumphantly reports The Doctor has been captured and locked in the compost room, while Hargreaves interrupts with a frantic call from Amelia Ducat …
Miss Ducat’s sudden demand to see Sir Colin Thackeray for an unpaid debt intrudes on the gatehouse standoff. The Watchman’s report carries a personal threat wrapped in a debt collection—one …
Amelia Ducat navigates the opulent but treacherous confines of Chase’s library to secure long-overdue payment for a painting. Their polished small talk masks sharp financial negotiation, with Amelia seizing the …
As Amelia concludes her business with Chase over payment for a painting, Scorby enters to remind him of the ongoing experiment in the compost room. Chase settles the debt and …
Trapped in Chase's estate with the Doctor still at large and a merciless Scorby prowling the corridors, Sarah seizes a split second of vulnerability to reveal herself to Amelia. The …
Dunbar enters Chase's library to issue a final warning about the Krynoid experiment, but the scientist dismisses ethical boundaries and vows to continue. Hargreaves interrupts with frantic reports that the …
With the cottage barricaded against the encroaching Krynoid, Scorby’s walkie-talkie bleeps to life as Chase demands answers about the disturbance. Chase’s intrusion forces Scorby to report the dire reality of …
Scorby seizes the Doctor’s walkie-talkie, attempting one last appeal to Chase, but the broken transmission dies as the Krynoid’s sentience asserts itself. A crushing tentacle breaches the cottage, shattering the …
Major Beresford directs his team to unleash another concentrated laser barrage at the advancing Krynoid biomass. The strike erupts across the grounds as the alien surges closer to the research …
The Doctor shouts for the others to use a rear exit as the Krynoid advances, guiding them past the alien’s blind spot. Major Beresford orders a laser barrage directly into …
Chase's simmering panic erupts into outright sabotage as he views the defoliant tanks and the facility's sterile order. He targets the music system with violent precision, its destruction a visceral …
Major Beresford retreats to a failing radio station in the facility’s outer wing as the Krynoid’s tendrils overwhelm the corridors outside. The static-choked signal bars fade with every second, but …
With laser attacks failing to slow the Krynoid’s advance, the Doctor seizes direct communication with Major Beresford to force a radical rethink. He delivers a stark timeline before the organism …
Chase, infected by the Krynoid and its zeitgeist of dominion, attempts to sacrifice Sarah Jane to the compost machine as part of his twisted devotion. The Doctor intervenes just as …
Season Bridges
Connections in this arc that cross season boundaries.