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Sergeant
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Captain Hart

loyal pragmatic authoritative disciplined procedure-oriented blunt observant dutiful
Captain Hart commands HMS Seaspite Naval Research Establishment during 19th-century maritime conflicts. A career naval officer with institutional distrust of unauthorized intrusions, he balances operational authority with administrative control while leading investigations into escalating maritime disappearances. Hart maintains strict discipline, combining factual precision with growing alarm at the unexplained nature of recent losses. His leadership style favors decisive action through official channels, even as he privately acknowledges the supernatural implications of the disturbances beneath the waves.
58 appearances
Royal Navy maritime operations
Also known as: Hart, HART

Captain Hart's Journey

A timeline through the narrative

58 moments
Season 7 (4) Season 9 (54)
S7E8 · Doctor Who and The Silurians Part 4
Baker Overpowers Hart in Sickbay

Initially professional and attentive, but his emotional state shifts to one of sudden, disorienting betrayal as he is incapacitated. His trust in Baker—and by extension, UNIT’s chain of command—is shattered in an instant.

Sergeant Hart stands guard over Major Baker in sickbay, adhering strictly to the Brigadier’s orders. When Baker requests assistance removing his jacket due to feigned stiffness, Hart complies without suspicion, …

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S7E8 · Doctor Who and The Silurians Part 4
Brigadier Escalates Cave Invasion

Concerned but resolute, with a growing sense of urgency. Her determination to accompany the Doctor stems from a mix of loyalty, curiosity, and a desire to prevent further violence. She is not easily deterred, even by the Doctor’s warnings.

Liz challenges the Brigadier’s decision to abandon the search for Major Baker and questions his insistence on proceeding with the invasion. She learns of Quinn’s death from the Doctor and …

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S7E8 · Doctor Who and The Silurians Part 4
Doctor Reveals Silurian Intelligence to Liz

Submissive and apologetic, but eager to rectify his mistake, reflecting the hierarchical pressures of UNIT.

Sergeant Hart is admonished by the Brigadier for failing to restrain Major Baker, offering to set up a search party before being dismissed. His presence highlights the operational failures within …

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S7E10 · Doctor Who and The Silurians Part 6
Silurian ambush kills two soldiers

Shifts from professional concern to alarm to fatal shock—his death is swift and unexpected, a victim of the Silurians’ stealth and aggression.

Sergeant Hart is initially concerned when Wright’s transmission cuts off, his attempts to reconnect the field telephone met with silence. He follows Captain Hawkins’ orders to investigate gallery five, his …

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Affiliations

Royal Navy
leader
Strategic Naval Command Execution and Fleet Deployment Operations

Captain Hart is the commanding officer of HMS Seaspite Naval Research Establishment, leading anti-invasion operations within the Royal Navy's maritime operations sphere.

UNIT (United Nations Intelligence Taskforce)
member
Global Advanced Technological Crisis Response and Covert Military Scientific Operations

Hart is a direct subordinate to Brigadier Lethbridge-Stewart and his duties such as field tactics suggest he is a dedicated member of UNIT.

Royal Marines (Attached to Naval Task Force)
representative
Tactical Ground Defense and Amphibious Operations

As a commanding officer of the Royal Navy, Captain Hart leads and coordinates with the Royal Marines during naval operations, indicating a representative or command relationship.

Across the Seasons

How this character reads at season scale

Season 7 · planet

Direct subordinate to Brigadier Lethbridge-Stewart, specializing in field tactics and detainee restraint during the Silurians crisis. Operates under Lethbridge-Stewart's command but with distinct operational responsibilities.