This page lists appearances of the . This timeline is based upon observations of the Kate Stewart in the order in which she experienced them Doctor Who universe and the events that occur during each of these stories. From these observations we have attempted to build a concise timeline. It is assumed, much like its TV story counterparts that for each novel or audio series their published/numbered order is the order they occur in. This does not apply to short stories which are often ambiguous about their placement. There are also many gaps between stories.
The layout of this timeline is in part based on the observations on
Doctor Who Reference Guide and Doctor Who - The Complete Adventures, as well as Lance Parkin's and other sources that allow us to make observations, such as AHistory The Whoniverse, Doctor Who Reviews, The History of Doctor Who, The Discontinuity Guide, Clive Banks databanks, and The Divergent Universe forum. None of these sources should be used solely as a source or considered a "true" timeline for stories.
Dr. Who • The Other • The Valeyard • Merlin Unbound Doctor • Meta-Crisis The Curator • "Curse" Doctors • "Fugitive" Doctor
K9 Mk I • K9 Mk II • K9 Mk III • K9 Mk IV
The Master ( Incarnations) Early • "UNIT era" • "Decayed" • "Tremas" • "Merlin" • "Tzun" • "Bruce" 14 • "War" • "Child" • "Saxon" • Missy • "O"
Paul Magrs • Simon & Kelly
Santa Claus • Queen Elizabeth I • William Shakespeare • Queen Victoria • Holmes & Watson • Harry Houdini • Winston Churchill • Adolf Hitler • Queen Elizabeth II
Time Lords Rassilon • Omega • The Monk • Pandad IV • Socra • Goth • Borusa • Andred • The Rani • Darkel • The Valeyard • Irving Braxiatel • Vansell • Auteur/Astrolabus • Narvin • Straxus • Rasmus • Livia • Veklin • Ollistra • The General • The Corsair
Doom Coalition The Eleven • Caleera • Padrac • The Clocksmith
UNIT The Brigadier • Benton • Yates • Kate • Osgood • Carter • Bishop • Shindi • Jacqui • Ruth & Charlie
Torchwood Institute Jack • Yvonne • Gwen • Tosh • Owen • Ianto • Suzie • Andy • Rhys • Bilis • Captain John • Norton
13 Bannerman Road Sarah Jane • Maria • Luke • Kelsey/ Ceol • Clyde • Rani • Haresh • Gita
Coal Hill defenders Charlie • Quill • April
Alpha Centauri • Jago & Litefoot • Abby & Zara • Menzies • Death's Head • Vienna • Suz • Kalendorf • Ohila • Jackie • Trinity Wells • Sylvia • Jenny • Nat • Christina • Dorium • Vastra, Jenny, & Strax • Lucy Celestial Toymaker
Josiah W. Dogbolter
Space Security Service • Anti-Dalek Force • Sisterhood of Karn • Shadow Proclamation • Raxas Alliance • Intrusion Counter-Measures Group • The Forge • The Church • Special Executive
Timeline [ ]
Early life [ ]
The events of The Schizoid Earth are almost five years ago. The Brigadier is married to Fiona and Kate has been born.
Kate is five years old.
UNIT career [ ]
Set in December 2011.
Set on Friday 11th December 2011. Kate visits her father on the night he passed away and later attends his funeral in January 2012.
Kate meets the Doctor for the first time, in his eleventh incarnation.
Set during Christmas-time. Osgood hasn’t started working for Kate now, and they have only met on one previous occasion.
Extinction [ ]
Set between The Power of Three and The Day of the Doctor. 
Shutdown [ ]
Silenced [ ]
Assembled [ ]
Encounters [ ]
Cyber-Reality [ ]
Set directly after False Negative. A few months have passed since The Dalek Transaction.
Set shortly after Game Theory.
Set directly after Telepresence.
Set directly after Code Silver.
Revisitations [ ]
Set directly after Master of Worlds.
Incursions [ ]
Osgood creates a crude chronon wave tracker and the Doctor later perfects this device, and leaves it for UNIT should they ever need to use it again, setting this before The Power of River Song.
UNIT have a fully functioning chronon wave tracker, setting this after The Sacrifice of Jo Grant. Kate meets River Song for the first time.
Operation Double [ ]
Kate summons the Eleventh Doctor and Clara to investigate the mystery at the Under-Gallery. There is a photo of Kate with River Song in the Black Archive, setting this after The Power of River Song.
Osgood is mentioned to have started wearing a bowtie but has not met the Twelfth Doctor, placing this story before she meets him in Death in Heaven.
Kate encounters Missy for the first time, who kills one of the Osgoods.
Nemesis [ ]
Kate recalls her encounter with Missy, setting this after Death in Heaven.
Kate recalls the events of The Day of the Doctor.
Working without Osgood [ ]
Set in Summer 2015, before The Magician's Apprentice.
Kate now has Jac as her scientific advisor.
Operation Double Part Two [ ]
Set two years after The Day of the Doctor.
Set directly after The Zygon Invasion. Osgood returns to Kate at UNIT with her new double.
Set in September 2015. There are two Osgoods working for UNIT, setting this after The Zygon Inversion.
Set in March of an unspecified year. There are two Osgoods and UNIT have lost one before, setting this after The Zygon Inversion.
Kate, Osgood, and UNIT investigate the spaceship crash at St Luke's University during the Doctor's time with Bill.
Kate and Bill are already familiar with each other, placing this after The Lost Dimension.
Defunded [ ]
In 2017, Kate meets with Prentis to discuss his decision to accept the withdrawal of funding for UNIT. Figuring out that he is an extraterrestrial threat, she opposes him. After narrowly escaping an assassination attempt, Kate is forced to go on the run.
Kate attends Sarah Jane's funeral.
In August 2020, Kate investigates the Time Fracture. She mentions that she is the former chief of operations at UNIT.
On 5 December 2021, Kate meets the Thirteenth Doctor for the first time while leading the resistance force against the Sontaran occupation.
Unplaced [ ]