Theory:Timeline - UNIT

This page lists appearances of UNIT in chronological order. This timeline is based upon observations of the 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 that for each novel, comic, audio or television series, their published, broadcast or numbered order is the order they occur in.

Note that the placing of UNIT stories is especially complicated due to the UNIT dating controversy.

Origin

 * TV: The Invasion

Liz Shaw

 * TV: Spearhead from Space
 * The Doctor has regenerated from his previous incarnation. Upon recovering, he assists UNIT in combating the Nestene Consciousness's Auton invasion and is asked by Brigadier Alistair Gordon Lethbridge-Stewart to become UNIT's scientific advisor with Dr. Liz Shaw, and he accepts in return for a car.


 * COMIC: The Arkwood Experiments


 * COMIC: The Multi-Mobile


 * COMIC: Insect


 * PROSE: The Mind Extractors


 * PROSE: The Ghouls of Grestonspey


 * PROSE: Caught in the Web
 * Liz is examining the leftovers of the Auton invasion, setting this shortly after Spearhead from Space.


 * PROSE: Invaders Invisible
 * The Doctor has not yet had an adventure on Earth without the Brigadier since his exile began.


 * PROSE: The Dark Planet


 * PROSE: Caverns of Horror


 * PROSE: A Universe Called Fred


 * COMIC: The Metal Eaters
 * The Doctor and Liz go to Stegmoor to investigate reports of a crashed Voord spaceship, but find nothing. (AUDIO: Beachhead)


 * COMIC: Undercover


 * AUDIO: Vengeance of the Stones
 * RAF Lieutenant Mike Yates is asked to join UNIT, with a promotion from lieutenant to captain.


 * TV: Doctor Who and the Silurians
 * The Doctor encounters the Silurians for the first time, but, to his dismay, they are killed and their city destroyed on the Brigadier's orders.


 * PROSE: The Straw that Broke the Camel's Back
 * The outcome of Doctor Who and the Silurians is still fresh on the Doctor's mind.


 * AUDIO: Shadow of the Past
 * The Doctor is still unhappy about the outcome of Doctor Who and the Silurians. Liz mentions Captain Yates, setting this after Vengeance of the Stones.


 * AUDIO: Old Soldiers
 * Set a few weeks after Doctor Who and the Silurians.


 * TV: The Ambassadors of Death
 * The Doctor has yet to forgive the Brigadier for the outcome of Doctor Who and the Silurians. Corporal Benton has only recently been promoted to Sergeant.


 * AUDIO: The Christmas Dimension


 * PROSE: UNIT Christmas Parties: First Christmas
 * Liz has been working with UNIT for "a few months", and her complaints about her job here are similar to those that the Brigadier cites as her reason for leaving. The TARDIS console has also been removed from within the ship, as it was in The Ambassadors of Death.


 * AUDIO: Walls of Confinement
 * This is the second time the Doctor has visited a zoo, setting this after The Arkwood Experiments.


 * AUDIO: A Home From Home


 * PROSE: Prelude White Darkness
 * The Brigadier finds it doubtful that the Doctor can get the TARDIS to work, setting this before Inferno.


 * AUDIO: The Last Post
 * Concludes shortly before Inferno.


 * TV: Inferno
 * In an attempt to get his TARDIS working, the Doctor is transported to a different dimension, where the Earth is destroyed as a result of the Inferno Project. Returning to his own dimension before the destruction, the Doctor is able to prevent the Inferno Project from destroying it.


 * PROSE: Ashes of the Inferno


 * PROSE: Still Lives
 * Set immediately after Inferno.


 * COMIC: The Fishmen of Carpantha


 * COMIC: Doctor Who and the Rocks from Venus


 * PROSE: Soldiers from Zolta
 * It is summer.


 * PROSE: The Science of Magic


 * PROSE: The Eye of the Giant
 * Sergeant Mike Yates sees inside the TARDIS for the first time, and the Doctor mentions visiting the parallel universe from Inferno.


 * AUDIO: The Blue Tooth
 * Liz decides to leave UNIT.


 * AUDIO: Binary
 * Liz announces her intentions to leave UNIT.


 * PROSE: The Scales of Injustice
 * Liz officially leaves UNIT, Yates is promoted to from sergeant to captain, and the Doctor is in a new laboratory.


 * PROSE: Prisoners of the Sun
 * Liz has just recently left UNIT.


 * AUDIO: The Rings of Ikiria
 * Set after Doctor Who and the Silurians.


 * COMIC: Castaway


 * COMIC: Levitation


 * PROSE: The Devil Goblins from Neptune
 * Liz is called back to UNIT, and has been absent long enough for the Doctor to admit missing her company.


 * PROSE: Reconnaissance
 * The Master is at large, setting this after Prisoners of the Sun.


 * PROSE: Country of the Blind
 * Liz has decided to tell the Doctor about her decision to officially leave UNIT, setting this after the Doctor found out from the Brigadier during Prisoner of the Sun.


 * AUDIO: Taken For Granted
 * Set shortly before Terror of the Autons. The Doctor reprimands Sergeant Benton outside Jack Canning's office when he sees him dressed up like him.


 * PROSE: Reconnaissance
 * After Prisoners of the Sun as the Master is active, unbeknown to the Brigadier.

Jo Grant

 * TV: Terror of the Autons
 * Jo Grant joins UNIT as the Doctor's new assistant, just in time for UNIT's first open battle with . The Doctor steals a dematerialisation circuit from the Master's TARDIS, stranding his new enemy on Earth with him.


 * AUDIO: The Doll of Death
 * Though the audio's blurb places it between The Dæmons and Day of the Daleks, Jo is still quite new to UNIT, and is unaware of the true nature of the TARDIS, setting this before The Claws of Axos.


 * PROSE: Dark Intruders


 * PROSE: The Claw


 * PROSE: Saucer of Fate


 * AUDIO: Damascus


 * TV: The Mind of Evil
 * The Master reclaims his dematerialisation circuit, and promptly leaves in his TARDIS.


 * PROSE: Deadly Reunion
 * The Master has a working TARDIS, setting this after The Mind of Evil.

Christmas Truce]]''
 * PROSE: ''[[UNIT Christmas Parties: Christmas Truce (short story)|UNIT Christmas Parties:
 * The Doctor hasn't seen the Master since Deadly Reunion.


 * AUDIO: The Sacrifice of Jo Grant
 * Set during Jo's first year at UNIT. The Doctor doesn't have the TARDIS working yet, and UNIT considerers the Master a threat to Earth safety, setting this between The Mind of Evil and Colony in Space.


 * TV: The Claws of Axos
 * From a deal with the Master, the Doctor is able to restore his TARDIS back to working order, only to discover the Time Lords have programmed it to always return him to 20th century Earth.


 * AUDIO: The Mega
 * The Mega received advice from the Master, setting this after he got his TARDIS working in The Mind of Evil. The Nuton Power Complex is referenced, setting this after The Claws of Axos.


 * TV: Colony in Space


 * TV: The Dæmons
 * After his failed escape attempt upon his defeat in Devil's End, the Master is arrested by UNIT.


 * PROSE: Freedom
 * Set after the Master's arrest in The Dæmons.


 * AUDIO: Degrees of Truth
 * The events of Freedom are mentioned.


 * AUDIO: Gardeners' Worlds


 * PROSE: Who Killed Kennedy


 * AUDIO: The Magician's Oath
 * Set between The Dæmons and Day of the Daleks.


 * COMIC: The Man in the Ion Mask
 * Set sometime after The Dæmons, and not long before The Face of the Enemy, as the Master is being held in Aylesbury Grange Detention Centre


 * TV: Day of the Daleks


 * PROSE: Missing in Action
 * Set shortly after the events of Day of the Daleks.


 * PROSE: The Monster in the Woods
 * The Doctor refers to the events of Day of the Daleks.


 * PROSE: Harvest of Time
 * Set between The Dæmons and The Sea Devils, as the Master is still in prison. The Brigadier mentions the Daleks, setting this after Day of the Daleks.


 * PROSE: The Face of the Enemy


 * PROSE: Honest Living
 * Set shortly after The Curse of Peladon.


 * PROSE: The Switching
 * The Master changes the internal configuration of the Doctor's TARDIS, setting this after The Curse of Peladon, and before The Sea Devils, as the Master is sent to Fortress Island.


 * COMIC: The Forgotten
 * The Master is said to be locked up on a secure island, setting this shortly before The Sea Devils.


 * AUDIO: Find and Replace
 * Set after The Sea Devils, as the Doctor is making a device to track the Master and Jo has encountered the Daleks.


 * AUDIO: The Other Woman
 * Set after The Mutants, as Jo hasn't been in the TARDIS very often, the Master is free and the Doctor is anticipating being freed from his exile soon.


 * AUDIO: Prisoners of the Lake
 * Authorial intent places this between Day of the Daleks and The Time Monster.


 * AUDIO: Storm of the Horofax
 * The Doctor is still in exile, and refers to the events of Colony in Space and The Mutants.


 * PROSE: The Touch of the Nurazh
 * The events of The Mutants are mentioned.


 * PROSE: Where the Heart Is
 * Set three years after Spearhead from Space. The Doctor lists his work for the Time Lords, with The Mutants being the last one he mentions. This is also where UNIT acquires the manor house seen in The Three Doctors.


 * AUDIO: Primord
 * Jo recalls the events of The Sea Devils. Jo and Liz meet for the first time, and the Doctor and Liz last saw each other in The Sentinels of the New Dawn.


 * COMIC: Change of Mind
 * The Doctor and Liz spend some time together and reference her departure from UNIT, setting this after Primord. Supposedly set in January 1971.


 * AUDIO: The Scream of Ghosts
 * Jo recalls her recent encounter with Liz, setting this shortly after Primord.


 * AUDIO: Poison of the Daleks
 * The Doctor mentions Peladon, setting this after The Curse of Peladon.


 * AUDIO: Operation: Hellfire
 * Jo has faced the Ogrons before, setting this after Day of the Daleks. The Doctor's TARDIS is still limited in its capabilities, and the Doctor is sent on a mission by the Time Lords, setting this before The Three Doctors.


 * PROSE: Rags
 * Jo recalls the Daleks and Ogrons, setting this after Day of the Daleks. Likewise, the Doctor confesses that sheep have never filled him with dread before, setting this before Verdigris.


 * TV: The Time Monster
 * Jo comments on the TARDIS's new interior design, which the Doctor dismisses as a "redecoration".


 * COMIC: Target Practice


 * The Doctor investigates a mysterious infantryman's jacket. (AUDIO: Tales from the Vault)


 * PROSE: Verdigris
 * Ending leads directly into The Three Doctors.


 * TV: The Three Doctors
 * The Doctor's knowledge of time travel is restored to him as a reward for defeating Omega. However, he doesn't leave immediately, as he needs to fix up the TARDIS further.


 * AUDIO: The Scorchies
 * The Scorchies song mentions the Gell guards, setting this after The Three Doctors. The Doctor is still working on the TARDIS.


 * AUDIO: The Many Deaths of Jo Grant
 * In the first artificial scenario, the Brigadier refers to the Doctor recently being released from his exile on Earth by the Time Lords, setting this shortly after The Three Doctors.


 * COMIC: The Heralds of Destruction
 * The Doctor admits to Jo that he has come to find comfort in Earth since his exile was lifted, and that he reason he keeps returning is to see his friends there. Some of his abilities that were previously blocked by the Time Lords are still returning, setting this shortly after The Three Doctors.


 * AUDIO: The Havoc of Empires
 * The Doctor's exile has been rescinded recently by the Time Lords, setting this shortly after The Three Doctors. Jo and Mike plan to take trips into history for their dates, and Mike has accompanied the Doctor and Jo to other planets before, but is treating time travel as a new experience.


 * PROSE: Listen - The Stars


 * PROSE: Out of the Green Mist


 * PROSE: Dancing the Code
 * Set a week after Planet of the Daleks, from the Doctor and Jo's perspectives, who have spent the past few weeks trying and failing to get to Metebelis III.


 * AUDIO: Time Tunnel
 * Jo is familiar with the Doctor entering comas, setting this after Planet of the Daleks.


 * PROSE: Speed of Flight
 * The Doctor is attempting to take Jo and Mike to Karfel, leading into of Timelash.


 * PROSE: The Clean Air Act
 * Jo demonstrates her growing environmental awareness, setting this after Come Friendly Bombs....


 * PROSE: Last of the Gaderene
 * Set between Planet of the Daleks and The Green Death.


 * TV: The Green Death
 * Jo leaves UNIT, and the Doctor's company, to marry ecologist Professor Clifford Jones.


 * AUDIO: Council of War
 * Benton refers to the events of The Green Death.


 * PROSE: Deep Blue
 * The Brig encounters the Fifth Doctor while the Third is having a break from UNIT.


 * PROSE: Smash Hit


 * COMIC: Secret of the Tower


 * PROSE: Faithful Friends: Part 1
 * Set before The Time Warrior.

Sarah Jane Smith

 * TV: The Time Warrior


 * AUDIO: The Paradise of Death / PROSE: The Paradise of Death


 * COMIC: Doomcloud


 * 1974-1979 - TV: Invasion of the Dinosaurs
 * Conflicting dates provided by UNIT's dating protocol. (PROSE: The Enfolded Time)


 * AUDIO: The Ghosts of N-Space


 * PROSE: Signal S.O.S.


 * COMIC: In With the Tide
 * The Doctor is driving the "Whomobile", setting this after Invasion of the Dinosaurs. The Doctor and Sarah have been absent from UNIT long enough for it to have been infiltrated by the Remoraxians. Liz, Sarah Jane and the Brigadier are kidnapped Adam Mitchell, leading directly into Endgame.


 * PROSE: Numb
 * Set seven weeks after Invasion of the Dinosaurs.


 * PROSE: Island of Death
 * Sarah mentions her vacation in Sicily, setting this after The Ghosts of N-Space.


 * PROSE: A Visit from Saint Nicholas


 * PROSE: An Overture Too Early
 * Set shortly before  Planet of the Spiders.


 * PROSE: Island of Death
 * The Doctor senses that he will soon regenerate.


 * TV: Planet of the Spiders
 * As witnessed by the Brigadier and Sarah Jane, the Doctor regenerates into his next incarnation.

The Fourth Doctor years

 * TV: Robot
 * Follows Planet of the Spiders. The Fourth Doctor leaves with Sarah Jane and Harry Sullivan.


 * PROSE: An Overture Too Early [epilogue]


 * TV: Terror of the Zygons


 * COMIC: Official Secrets


 * PROSE: Double Trouble


 * TV: The Android Invasion


 * PROSE: Avast There!


 * PROSE: UNIT Christmas Parties: Ships That Pass


 * TV: The Seeds of Doom


 * PROSE: Hello Goodbye


 * AUDIO: The Oseidon Adventure
 * The Brigadier still works for UNIT. Supposedly set in 1979. Sequel to The Android Invasion.


 * PROSE: No Future
 * The Seventh Doctor implants the idea of the Brigadier retiring. Supposedly set in 1976.

Post-Brigadier Lethbridge-Stewart

 * 1980 - AUDIO: The Fires of Vulcan


 * 1980 - COMIC: Doctor Who and the Star Beast


 * TV: The Five Doctors
 * Colonel Crichton is now leading UNIT and he is described as the Brigadier's direct successor.


 * 1980s - AUDIO: The Architects of History
 * Klein recognises the Doctor, but only based on the fact he arrived in his TARDIS. She indicates that it's two years since he worked for UNIT.


 * 1980s - AUDIO: Dominion
 * Since the Seventh Doctor visited Klein in The Architects of History, he has been keeping an eye on her, causing Klein to think that he's stalking her. The Brigadier has retired, and Klein says she was promoted to Scientific advisor "a few years back" after the Fourth Doctor retired from UNIT. Major Wyland-Jones becomes head of UNIT.


 * 1984 - COMIC: The Fires Down Below


 * 1984 - AUDIO: The Helliax Rift


 * 12 December 1985 - COMIC: Skywatch-7


 * 1 January 1990 - PROSE: The Enfolded Time


 * 27 September 1990 - AUDIO: Persuasion


 * 1992 - AUDIO: Hour of the Cybermen


 * 1994 - AUDIO: Warlock's Cross
 * Wyland-Jones is still head of UNIT while Winifred Bambera has yet to rise to any notoriety within the ranks of UNIT.


 * 1995 - HOMEVID: Downtime
 * In the novelisation, Brigadier Crichton is leading UNIT and Winifred Bambera is a Captain.


 * 1996 - HOMEVID: Auton


 * August 1996 - PROSE: Interference - Book One / Interference - Book Two


 * 1997 - TV: Battlefield
 * Winifred Bambera is now leading UNIT.


 * 7 May 1997 - PROSE: The Dying Days
 * Set in 1997. The Brigadier is promoted to the rank of General.


 * PROSE: UNITed We Fall


 * 1997 - PROSE: The Dying Days


 * 1997 - PROSE: Vampire Science


 * 1998 - HOMEVID: Auton 2: Sentinel


 * 1998 - HOMEVID: Auton 3: Awakening


 * 1999 - COMIC: Darkness, Falling


 * 1999 - COMIC: The Mark of Mandragora


 * c. 1990s - COMIC: Evening's Empire

2000s

 * 2000 - AUDIO: Old Soldiers


 * 2001 - AUDIO: Animal


 * 2003 - TV: Fragments
 * Five years prior to her death in 2008, Toshiko Sato is arrested by UNIT but freed by Jack Harkness, who offers her a place at Torchwood Three.


 * 2004 - AUDIO: The Coup


 * 2004 - AUDIO: Time Heals


 * 2004 - AUDIO: Snake Head


 * 2005 - AUDIO: The Longest Night


 * 2005 - AUDIO: The Wasting


 * March 2006 - TV: Aliens of London/World War Three
 * The Ninth Doctor identifies a group of alien experts from the United Nations Intelligence Taskforce.


 * Christmas 2006 - TV: The Christmas Invasion


 * June 2008 - TV: The Sound of Drums
 * First contact with the Toclafane is hosted on the UNIT aircraft carrier Valiant, designed by Harold Saxon.


 * June 2008 - TV: Last of the Time Lords
 * UNIT command radio the Valiant after the President of the United States is assassinated.


 * c. September 2008 - TV: Revenge of the Slitheen (mentioned only)
 * Sarah Jane Smith arranges for UNIT to clean up Coldfire Construction after defeating the Slitheen.


 * March 2009 - TV: The Sontaran Stratagem / The Poison Sky
 * UNIT is now known as the Unified Intelligence Taskforce.


 * 2009 - AUDIO: The Chiswick Cuckoos
 * Josh Carter is a Second Lieutenant and Martha still works with UNIT. Malcolm Taylor is mentioned.


 * c. April 2009 - TV: The Stolen Earth/Journey's End


 * Easter 2009 - TV: Planet of the Dead


 * 2009 - AUDIO: The Three Companions


 * 2009 - AUDIO: Dissected
 * Martha is working at UNIT base in Hereford, which is destroyed. Reference is made to the events of Journey's End, and Ianto is still alive, setting this before Children of Earth: Day One.


 * September 2009 - TV: Children of Earth: Day One / Day Three / Day Four / Day Five


 * 2009 - TV: Enemy of the Bane


 * 2009 - COMIC: Don't Step on the Grass
 * Martha has left UNIT, setting this after Dissected. Erisa Magambo and the Doctor have another encounter, setting this after Planet of the Dead.


 * December 2009 - TV: The End of Time

Science Leads

 * 24 April 2010 - PROSE: Happy Endings


 * 4 May 2010 - GAME: Blood of the Cybermen (mentioned only)
 * Having defeated a Cyberman incursion in the Arctic, the Eleventh Doctor predicts that UNIT will clean up.


 * 2010 - COMIC: The Genius Trap


 * 2010 - COMIC: The Age of Ice


 * 2010 - TV: Death of the Doctor


 * 2011 - COMIC: The Golden Ones


 * 2011 - AUDIO: Tales from the Vault
 * Captain Matheson tells Warrant Office Sato about the Terravore incursion in the London Underground in 2010.


 * In 2011, as noted by Jack Harkness, UNIT seals off the Blessing after "the Miracle" is negated. (TV: The Blood Line )


 * August 2012 - AUDIO: The Hexford Invasion / Survivors in Space


 * TV: The Power of Three
 * Kate Stewart meets the Doctor, in his eleventh incarnation, for the first time. The Brigadier has already passed away, setting this after December 2011.


 * PROSE: For the Girl Who Has Everything
 * Set during Christmas-time. Osgood hasn’t started working for Kate yet, and they have only met on one previous occasion.


 * 2013 - TV: The Bells of Saint John


 * 2013 - AUDIO: Mastermind
 * Charlie Sato refers to the Thames Mead Massacre in London in 2012.

Shindi's injury

 * AUDIO: Vanguard
 * AUDIO: Earthfall
 * AUDIO: Bridgehead
 * AUDIO: Armageddon
 * According to Big Finish, Extinction is between The Power of Three and The Day of the Doctor. Josh Carter is a new recruit in Vanguard, placing this definitively as the start of the UTNS timeline. Shindi is injured fighting the Autons.


 * AUDIO: Power Cell
 * Osgood imagines the Eleventh Doctor visiting the Tower of London after allowing her mind to wander while showing Jay the thought projector, however it is left unclear as to whether or not she has met him.


 * AUDIO: Death in Geneva
 * Osgood recalls fighting Autons in the Gobi Desert, setting this after UNIT: Extinction.


 * AUDIO: The Battle of the Tower
 * Atkins is guarding the Black Archive.


 * AUDIO: Ice Station Alpha
 * The Antarctic winter won't end for another three weeks.


 * AUDIO: House of Silents
 * Shindi has recovered from his injury but is still using a wheelchair. Kate is doing extra weapons training following her encounter with Cerberus in UNIT: Shutdown. Shindi mentions that Osgood was away in Antarctica while he was recovering from his injury.


 * AUDIO: Square One


 * AUDIO: Silent Majority
 * Set one month after Square One.


 * AUDIO: In Memory Alone
 * In Memory Alone is set several months after the end of House of Silents. Sam Bishop claims that "Osgoods can't be duplicated", setting this before The Day of the Doctor. Shindi is no longer using a wheelchair.

Fighting the Silurians

 * AUDIO: Call to Arms
 * Osgood believes that meeting Three Doctors at once would be a once in a lifetime experience, setting this before The Day of the Doctor.


 * AUDIO: Tidal Wave


 * AUDIO: Retrieval


 * AUDIO: United
 * UNIT has control of Lyme Industries weather station, setting this after Ice Station Alpha.

Dealing With the Auctioneers

 * AUDIO: The Dalek Transaction
 * Jacqui McGee is now an established ally to UNIT, following the events of In Memory Alone. UNIT learn that a group known as the Auctioneers are selling alien technology on the black market.


 * 31 October - AUDIO: Invocation
 * Set during Halloween.


 * AUDIO: The Sontaran Project


 * AUDIO: False Negative
 * The travel capsule was recovered from the auctioneer base in Vienna, setting this shortly after The Sontaran Project.


 * AUDIO: Game Theory
 * UNIT has been tracking the Auctioneers for months now since the events of Encounters and Shindi makes reference to the Shakri cubes.


 * AUDIO: Telepresence


 * AUDIO: Code Silver


 * AUDIO: Master of Worlds
 * Colonel Shindi is unfamiliar with the sight of flying Cybermen, while Osgood is thrilled to have survived meeting The Master, suggesting this takes place before Death in Heaven. The Master leaves UNIT with a parting gift, leading directly into Host of the Wirrn.


 * AUDIO: Hosts of the Wirrn
 * The Master's parting gift is revealed to be a Wirrn egg, which he took from the Auctioneers.


 * AUDIO: Breach of Trust


 * AUDIO: Open the Box


 * AUDIO: It Takes a Thief
 * Lady Christina de Souza catches the attention of UNIT and Sam Bishop is sent to investigate her.


 * AUDIO: Skin Deep
 * After being called by Lady Christina de Souza, Sam Bishop cleans up after the Amber.


 * AUDIO: Portrait of a Lady
 * Sam is leading the clean-up operation following the events of The Sontaran Project and refers to the fall of the Auctioneers, setting this after Cyber-Reality


 * AUDIO: Death on the Mile
 * Sam Bishop recalls his previous encounter with Lady Christina in Portrait of a Lady. Sam and Jacqui McGee are familiar with one another.

Further threats

 * AUDIO: This Sleep of Death
 * Osgood mentions the Sontaran incident, setting this after The Sontaran Project. The year is given as "20 odd years" after 1999, setting this story sometime around 2019.


 * AUDIO: Tempest
 * Sam mentions that they have survived Daleks and Cybermen, setting this after both Encounters and Cyber-Reality.


 * AUDIO: The Sacrifice of Jo Grant
 * Osgood and Jo are close friends, setting this after UNIT: Assembled. 1972 is 40 years in the past. 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.


 * 2013 - AUDIO: The Power of River Song
 * UNIT knows little about River Song and Kate Stewart meets her for the first time, setting this before Day of the Doctor where UNIT know more about River and possess a picture of Kate and River together. UNIT has a fully functioning chronon wave tracker, setting this after The Sacrifice of Jo Grant. Upon arriving in the past, Osgood notes that none of the car number plates go beyond 1973. She also mentions that she is "40-odd years" in the past, setting this story around 2013. However Kate also mentions that 2091 is 70 years in the future suggesting a 2021 setting. River says that 2091 is "nearly 80 years" in the future, and Osgood also mentions this, indicating an early 2010s setting.

The Two Osgoods

 * c. 2013 - TV: The Day of the Doctor
 * Osgood and Kate meet the Eleventh Doctor as well as the War Doctor and the Tenth Doctor. Preventing the discovery of a Zygon incursion from erupting into war, the three Doctors force UNIT and the Zygons to make a truce which will become Operation Double. Befriending her Zygon copy, there are now two Osgoods. According to the novelisation, Atkins was killed by the Zygon Kate Stewart.


 * COMIC: Empire's Fall
 * The Twelfth Doctor's physical appearance is based on series 8, suggesting this is around Clara's time period for Kate as well.


 * 2014 - COMIC: The Fractures
 * Set in 2014. Osgood is away investigating a UFO sighting, but has recently started wearing bow ties instead of her scarf and has yet to meet the Twelfth Doctor.


 * 2014 - AUDIO: The Screaming Skull


 * 2014 - AUDIO: Second Sight


 * 2014 - COMIC: After Life


 * c. 2014 - TV: Death in Heaven
 * Kate has her first encounter with the Twelfth Doctor and Missy, the latter of whom murders the Zygon Osgood.


 * Summer 2015 - COMIC: The Hyperion Empire
 * The Doctor claims they have arrived in Summer 2015. Authorial intent places this between Last Christmas and The Magician's Apprentice


 * c.September 2015 - TV: The Magician's Apprentice


 * c.September 2015 - TV: The Zygon Invasion / The Zygon Inversion
 * By this point, Kate is more than comfortable wielding a gun. The Zygon group Truth or Consequences attempt to break the ceasefire until the Twelfth Doctor convinces them to stand down. Their leader, Bonnie, joins and assumes the form of the surviving Osgood, who still refuses to disclose whether or not she is herself human or Zygon until the time comes when it does not matter.


 * September 2015 - COMIC: Clara Oswald and the School of Death
 * Two Osgoods are present, placing this after the events of The Zygon Invasion / The Zygon Inversion.


 * COMIC: Robo Rampage
 * Set after The Zygon Inversion.


 * 8 March 201X - AUDIO: Narcissus
 * Jacqui McGee recalls The Silence. UNIT has already lost one Osgood. The Zygon Osgood labels herself as replaceable whereas the other Osgood isn't, indicating that the first Zygon Osgood was the one killed in Death in Heaven.


 * AUDIO: Field Trip


 * 2016 - COMIC: Big in Japan


 * 18-24 October 2016 - PROSE: Yes, Missy


 * c. 2016 - TV: The Return of Doctor Mysterio


 * c. 2017 - COMIC: The Lost Dimension
 * Kate and Osgood meet the Doctor, now based at St Luke's University with companions Nardole and Bill Potts.


 * c. 2017 - COMIC: Tulpa
 * Kate is familiar with Bill Potts, placing this after The Lost Dimension.

Uncertain Future

 * On 1 January 2019, the Thirteenth Doctor learns that UNIT has had their funding temporarily suspended, (TV: Resolution) a fact which Jim later told the Eighth Doctor in 2020. (AUDIO: Lost Property)


 * 10 May 2020 - WC: The Zygon Isolation
 * The two Osgoods are self-isolating. They are aware of the Thirteenth Doctor, and exchange texts with her. One Osgood refers to being a Zygon, while the other claims that she can’t relate indicating that she is the human.


 * 17 August 2020 - WC: 14681 UNIT Field Log
 * Despite wearing UNIT uniform, and surrounded by UNIT insignia and designs, Sergeant Robert Dudley introduces himself as "formerly of UNIT".


 * 18 August 2020 - WC: 14682 UNIT Field Log
 * Doctor Errol Courtney says he's recording from "former UNIT Black Site". The lab is "woefully understaffed" due to "cutbacks".


 * 19 August 2020 - WC: 14683 UNIT Field Log
 * Sergeant Dudley enters the Time Fracture.


 * 20 August 2020 - WC: 14684 UNIT Field Log

Active once again

 * By 2025, UNIT's funding had seemingly been restored.


 * 2025 - PROSE: Horror of the Space Snakes


 * 23 April 2026 - AUDIO: A Death in the Family


 * 2027-2028 - AUDIO: A Death in the Family

Post-21st century

 * UNIT are mentioned as being active in 2119. (TV: Under the Lake / Before the Flood)

Unplaced

 * 1979 - AUDIO: The Valley of Death
 * In 1979, General Reginald Hemmings leads UNIT during The Brigadier's absence in Oslo.


 * AUDIO: The Screaming Skull


 * HOMEVID: Wartime


 * AUDIO: The Turn of the Screw
 * Charlie Sato hunts down a sonic screwdriver lost by the Eleventh Doctor in Leadworth, setting this after 2008.


 * AUDIO: The Tactics of Defeat
 * Ruth Matheson recalls the events of The Turn of the Screw.


 * PROSE: Listening Watch


 * PROSE: The Shadows of Avalon


 * PROSE: Genocide


 * PROSE: Head Games


 * 1990s - PROSE: The Pit
 * The Doctor claims that Brigadier Bambera can prove his credentials, setting this after Battlefield.


 * PROSE: The Nemertines