Societal Conflict
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The Frontios Colony Crisis

The human colony on Frontios faces relentless meteorite bombardment, environmental collapse, and internal power struggles as leadership fractures under authoritarianism and deception. The colonists' survival is further threatened by the psychic alien Tractators, who seek to assimilate them. The Fifth Doctor must unite the colonists, expose the Tractators' predation, and navigate the colony's suppressed secrets to save the settlement from utter destruction.

23 events across 1 season

Arc Timeline

Season 21

23 events
S21E9 · Frontios Part 3
Brazen imposes martial order on chaos

With the colony's fragile order collapsing under reports of Tractator reinforcements, Brazen seizes control of the tumultuous streets outside the overrun medical center. Shouting above the din of fleeing patients …

Start
Doctor shatters shield with sleight of hand

Trapped in the cavern’s grip, the Doctor improvises a desperate gambit. Spotting a massive globe with smaller globes clinging to it, he seizes it as cover just as the Tractators’ …

Start
Brazen confronts Cockerill over Frontios' fall

Brazen corners Cockerill in the state room to address the escalating looting and chaos on Frontios' surface. Cockerill, increasingly desperate and hopeless, declares the colony irretrievably lost and reveals the …

Start
Doctor triggers gravity beam escape

The Doctor seizes a phosphor lamp from their supplies and hurls it into the path of the Tractators' crushing gravity beam. The sudden release of its oppressive force frees Tegan …

Climax
Cockerill swallowed by shifting earth

Cockerill awakens in the aftermath of a gravity beam assault, disoriented and pressed beneath a deceptive terrain that shudders beneath him. As looters observe his desperate cries without aid, the …

Climax
Cockerill swallowed by Frontios' ravine

Cockerill’s frantic cries for aid are abruptly cut short as the unstable terrain beneath him gives way. The ground collapses without warning, dragging him screaming into the depths of Frontios’ …

Resolution
Leadership fractures over secrets and survival

Brazen accuses Range of historical information hoarding as the strain of Frontios' collapse forces leadership into open confrontation. Their debate exposes the devastation of withheld facts about the Tractators, a …

Climax
Doctor and Tegan ready for the unknown

The Doctor and Tegan stand in a narrow tunnel beneath Frontios, their phosphor lamps casting flickering shadows against the rock walls. The air hums with tension as the distant vibration …

Resolution
S21E10 · Frontios Part 4
Doctor confronts the Gravis in lair

The Doctor and Tegan enter the Tractator's lair where the Gravis immediately identifies them as valuable specimens, demonstrating his cold detachment. The Doctor introduces himself formally but with uncharacteristic hesitation, …

Start
Norna fights gripped Tractator on catwalk

Norna spots a Tractator ascending the catwalk and lunges, overpowering him briefly before being seized from behind and slammed against the wall. The Tractator’s grip crushes her throat and pins …

Start
Gravis details tyrannical plan in Operations Centre

The Doctor and Tegan confront the Gravis in the Tractators' Operations Centre, a cavernous chamber marked by a spiral design. The Gravis arrogantly reveals the facility’s true purpose as a …

Start
Range announces Tractator victory

Range arrives in the research room just as Cockerill attempts to rouse his colonists into resistance against the Tractators. His interruption with the declaration that the invaders have already overwhelmed …

Climax
Doctor abandons delay and orders Tegan to act

The Doctor and Tegan discuss the Tractators' gravity motor and the urgency of stopping their plan to control Frontios. When the Orderly is dragged away by a gravity beam, the …

Climax
Gravis distracted by TARDIS obsession

The Doctor lures the Gravis into the TARDIS with a false offer of surrender, knowing the Tractator leader’s pathological obsession will override tactical judgment. Once inside, the Gravis’s focus narrows …

Climax
Gravis imprisoned and Doctor departs

The Doctor ensures the Gravis is stranded on a lifeless planet while Plantagenet and Range reflect on humanity's isolation. In a private farewell, the Doctor gifts the colonists a modest …

Resolution