TARDIS Index File

Kate Stewart

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Kate Stewart
Species: Human
Job: Head of Scientific Research
Affiliated with: UNIT
Place of origin: Great Britain
Grandparents: Gordon Conall Lethbridge-Stewart, Mary Gore
Mother: Fiona Lethbridge-Stewart
Father: Alistair Gordon Lethbridge-Stewart
Brother: Mariama
Children: Gordon Lethbridge-Stewart
First seen in: Downtime
Appearances: see list
Main actor: Jemma Redgrave
Other TV actors: Beverley Cressman
Memorable moment
The Doctor Kills Some Time - Doctor Who - The Power of Three - BBC03:50

The Doctor Kills Some Time - Doctor Who - The Power of Three - BBC

Kate Stewart, also known as Kate Lethbridge-Stewart and nicknamed "Tiger" by her father, was the Chief Scientific Officer of UNIT. She was the daughter of Alistair Gordon Lethbridge-Stewart and his first wife Fiona, and the mother of Gordon Lethbridge-Stewart (TV: The Power of Three, PROSE: The Scales of Injustice, HOMEVID: Downtime) and another child. (TV: Death in Heaven)

Biography Edit

Childhood Edit

Fiona and Alistair had Kate three years into their marriage, which lasted eight years. As a child, Kate was never told of her father's work at UNIT with aliens and was only aware that he was a military man. She would often pretend that he was off to have an amazing adventure when she really "knew" he was off to do boring military operations. (HOMEVID: Downtime)

At the time of the Wenley Moor Silurian incident, Kate was five. It was during this mission that Alistair realised that he was an inadequate father for her. The secretive nature of his work with UNIT prevented him from being consistently present in her life. His long absences from home caused Fiona to leave him. Alistair guessed that she and Kate went off to at least initially live somewhere close to Chichester, the home of Kate's maternal grandparents. (PROSE: The Scales of Injustice)

Later life Edit

Eventually, Kate grew estranged from her father. (HOMEVID:Downtime) In her teens, Kate had a son whom she named Gordon Lethbridge-Stewart, thereby demonstrating a continued love of her father, despite her outward ambivalence and her decision not to reveal her pregnancy or Gordon's existence to him. Gordon's father, Jonathan, wanted to marry her, but she wanted to remain single. Jonathan and Kate split up when Gordon was two, leaving Kate to raise Gordon as a single parent. (PROSE: Downtime) Kate and her son made their home aboard a houseboat moored on an English canal.


Kate with her father. (HOMEVID: Downtime)

Because the cult based at New World University believed she might be able to lead them to the Brigadier, who they thought possessed a locus vital to the Great Intelligence, she and Gordon were harassed by students who staked out her houseboat. Frightened, she reconnected with her father and briefly fought alongside him and Sarah Jane Smith against the New World group. After the Great Intelligence was again defeated, she entered into a friendlier relationship with her dad, and ensured that Alistair could have a relationship with the grandson whom he had not previously known existed. (HOMEVID: Downtime)

Sarah Jane Smith Kate Lethbridge Stewart Downtime

Kate meets Sarah-Jane Smith. (HOMEVID: Downtime)

In 1997, Alexander Christian used Kate to get in touch with her father. He wasn't allowed to know the Brigadier's number for reasons of security, but he was readily told Kate's (it was 0122 69046). (PROSE: The Dying Days)

Deimos Rising Kate 2

Kate during her encounters with the Dæmon Mastho. (HOMEVID: Dæmos Rising)

In October 2003, Kate responded to a message from ex-UNIT operative Douglas Cavendish to investigate a haunting. Arriving at Cavendish's isolated cottage, she faced Mastho, one of the last Daemons — a demonic alien race which her father had previously battled more than thirty years before. They discovered that a future cult called the Sodality had revived, and transported Mastho through time for their purposes. This meant that the threat to the present was neutralised. (HOMEVID: Dæmos Rising)

Kate later married, had a second child, and became divorced. (TV: Death in Heaven) She dropped the name "Lethbridge" when she joined UNIT so as to be judged on her own merits and not be perceived as being the beneficiary of nepotism. (TV: The Power of Three)


Kate bids the Eleventh Doctor farewell following The Year of the Slow Invasion. (TV: The Power of Three)

Her father nevertheless quietly mentored her until his death. He instilled in her the position that "science leads", something he learned from "an old friend" (i.e., the Doctor). Kate eventually rose to the post of Head of Scientific Research, and established UNIT as a military organisation led by its scientists. In this capacity, she summoned the Eleventh Doctor and Amy Pond via his psychic paper to the Tower of London to investigate the mystery of the Shakri cubes. Kate attempted to warn the governments of the world of the cubes when they started their countdown. (TV: The Power of Three)

UNIT had in its possession a picture of Kate with River Song. (TV: The Day of the Doctor)

She ordered the airlifting of the TARDIS to London, to the agitation of the Eleventh Doctor. Kate summoned him there under the royal orders of Elizabeth I, giving him a sealed letter from the Queen and proving her credentials by showing him the impossible painting Gallifrey Falls No More within the National Gallery.

The letter decreed that the Doctor be made curator of the Under-Gallery, and that he be summoned should there be any disturbance there. Kate led the Doctor and Clara Oswald to the scene of the disturbance. There, she showed them more paintings, all landscapes with glass on the floor next to them. When the Doctor jumped through the fissure and met the Tenth Doctor and the War Doctor. Clara attempted to follow him before Kate restrained her.

Kate and Zygon Kate

Kate (right), in a stalemate with her Zygon double. (TV: The Day of the Doctor)

As she left the room to request important UNIT files, Kate was accosted by a Zygon who had escaped through one of the paintings and then took her image and pretended to be the real Kate to Clara Oswald. Osgood saved her from the Zygon nest. Kate, along with McGillop and Osgood, confronted their Zygon doppelgängers in the Black Archive. Kate ordered the countdown to detonate the Archive which would not only have prevented the Zygons from having control of the many weapons stored there, but would also destroy London in the process. The Zygon used Kate's voice to stop the detonation, but Kate countermanded the order.

Kate and her Zygon counterpart bickered over the detonation, before the Eleventh and Tenth Doctors triggered the memory modifiers to confuse everybody in the room as to whether they were a Zygon or a human. The two Kates stopped the countdown, and negotiated a peace treaty. (TV: The Day of the Doctor)

When the Cybermen emerged from St Paul's Cathedral in the 21st century, Kate arrived with Osgood and UNIT and took Missy and the Twelfth Doctor into custody. She told the Doctor that he was President of Earth and worked with him to battle the Cybermen. When the Cybermen attacked the plane Boat One, Kate was blown out by Missy. She was saved by her father, who had been converted into a Cyberman, and returned safely to the ground. (TV: Death in Heaven)

Behind the scenes Edit

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